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rsync(1)                         User Commands                        rsync(1)




NAME

       rsync - a fast, versatile, remote (and local) file-copying tool



SYNOPSIS

       Local:
           rsync [OPTION...] SRC... [DEST]

       Access via remote shell:
           Pull:
               rsync [OPTION...] [USER@]HOST:SRC... [DEST]
           Push:
               rsync [OPTION...] SRC... [USER@]HOST:DEST

       Access via rsync daemon:
           Pull:
               rsync [OPTION...] [USER@]HOST::SRC... [DEST]
               rsync [OPTION...] rsync://[USER@]HOST[:PORT]/SRC... [DEST]
           Push:
               rsync [OPTION...] SRC... [USER@]HOST::DEST
               rsync [OPTION...] SRC... rsync://[USER@]HOST[:PORT]/DEST)

       Usages with just one SRC arg and no DEST arg will list the source files
       instead of copying.



DESCRIPTION

       Rsync is a fast and extraordinarily versatile file  copying  tool.   It
       can  copy  locally,  to/from  another  host  over  any remote shell, or
       to/from a remote rsync daemon.  It offers a  large  number  of  options
       that  control  every  aspect  of  its behavior and permit very flexible
       specification of the set of files to be copied.  It is famous  for  its
       delta-transfer  algorithm,  which  reduces the amount of data sent over
       the network by sending only the differences between  the  source  files
       and  the  existing  files in the destination.  Rsync is widely used for
       backups and mirroring and as an improved copy command for everyday use.

       Rsync  finds  files  that  need to be transferred using a "quick check"
       algorithm (by default) that looks for files that have changed  in  size
       or   in  last-modified  time.   Any  changes  in  the  other  preserved
       attributes (as requested by options) are made on the  destination  file
       directly  when  the quick check indicates that the file's data does not
       need to be updated.

       Some of the additional features of rsync are:


       o      support for copying links, devices, owners, groups, and  permis-
              sions

       o      exclude and exclude-from options similar to GNU tar

       o      a  CVS  exclude  mode for ignoring the same files that CVS would
              ignore

       o      can use any transparent remote shell, including ssh or rsh

       o      does not require super-user privileges

       o      pipelining of file transfers to minimize latency costs

       o      support for anonymous or authenticated rsync daemons (ideal  for
              mirroring)



GENERAL

       Rsync  copies  files either to or from a remote host, or locally on the
       current host (it does not support  copying  files  between  two  remote
       hosts).

       There  are  two  different  ways  for rsync to contact a remote system:
       using a remote-shell program as the transport (such as ssh or  rsh)  or
       contacting  an  rsync daemon directly via TCP.  The remote-shell trans-
       port is used whenever the source or destination path contains a  single
       colon  (:)  separator  after a host specification.  Contacting an rsync
       daemon directly happens when the source or destination path contains  a
       double  colon  (::)  separator  after  a host specification, OR when an
       rsync:// URL is specified (see also the  "USING  RSYNC-DAEMON  FEATURES
       VIA  A REMOTE-SHELL CONNECTION" section for an exception to this latter
       rule).

       As a special case, if a single source arg is specified without a desti-
       nation, the files are listed in an output format similar to "ls -l".

       As expected, if neither the source or destination path specify a remote
       host, the copy occurs locally (see also the --list-only option).

       Rsync refers to the local side as the client and the remote side as the
       server.  Don't confuse server with an rsync daemon.  A daemon is always
       a server, but a server can be either a daemon or a remote-shell spawned
       process.



SETUP

       See the file README.md for installation instructions.

       Once  installed,  you  can use rsync to any machine that you can access
       via a remote shell (as well as some that you can access using the rsync
       daemon-mode  protocol).   For remote transfers, a modern rsync uses ssh
       for its communications, but it may have been configured to use  a  dif-
       ferent remote shell by default, such as rsh or remsh.

       You  can also specify any remote shell you like, either by using the -e
       command line option, or by setting the RSYNC_RSH environment  variable.

       Note  that  rsync  must be installed on both the source and destination
       machines.



USAGE

       You use rsync in the same way you use rcp.  You must specify  a  source
       and a destination, one of which may be remote.

       Perhaps the best way to explain the syntax is with some examples:

           rsync -t *.c foo:src/

       This would transfer all files matching the pattern *.c from the current
       directory to the directory src on the machine foo.  If any of the files
       already  exist on the remote system then the rsync remote-update proto-
       col is used to update the file by sending only the differences  in  the
       data.   Note  that the expansion of wildcards on the command-line (*.c)
       into a list of files is handled by the shell before it runs  rsync  and
       not  by  rsync  itself  (exactly the same as all other Posix-style pro-
       grams).

           rsync -avz foo:src/bar /data/tmp

       This would recursively transfer all files from the directory src/bar on
       the  machine foo into the /data/tmp/bar directory on the local machine.
       The files are transferred in archive mode, which ensures that  symbolic
       links, devices, attributes, permissions, ownerships, etc. are preserved
       in the transfer.  Additionally, compression will be used to reduce  the
       size of data portions of the transfer.

           rsync -avz foo:src/bar/ /data/tmp

       A  trailing slash on the source changes this behavior to avoid creating
       an additional directory level at the destination.  You can think  of  a
       trailing / on a source as meaning "copy the contents of this directory"
       as opposed to "copy the directory by  name",  but  in  both  cases  the
       attributes  of the containing directory are transferred to the contain-
       ing directory on the destination.  In other words, each of the  follow-
       ing  commands copies the files in the same way, including their setting
       of the attributes of /dest/foo:

           rsync -av /src/foo /dest
           rsync -av /src/foo/ /dest/foo

       Note also that host and module  references  don't  require  a  trailing
       slash to copy the contents of the default directory.  For example, both
       of these copy the remote directory's contents into "/dest":

           rsync -av host: /dest
           rsync -av host::module /dest

       You can also use rsync in local-only mode, where both  the  source  and
       destination don't have a ':' in the name.  In this case it behaves like
       an improved copy command.

       Finally, you can list all the (listable) modules available from a  par-
       ticular rsync daemon by leaving off the module name:

           rsync somehost.mydomain.com::

       See the following section for more details.



ADVANCED USAGE

       The  syntax for requesting multiple files from a remote host is done by
       specifying additional remote-host args in the same style as the  first,
       or with the hostname omitted.  For instance, all these work:

           rsync -av host:file1 :file2 host:file{3,4} /dest/
           rsync -av host::modname/file{1,2} host::modname/file3 /dest/
           rsync -av host::modname/file1 ::modname/file{3,4}

       Older  versions  of rsync required using quoted spaces in the SRC, like
       these examples:

           rsync -av host:'dir1/file1 dir2/file2' /dest
           rsync host::'modname/dir1/file1 modname/dir2/file2' /dest

       This word-splitting still works (by default) in the latest  rsync,  but
       is not as easy to use as the first method.

       If  you  need  to transfer a filename that contains whitespace, you can
       either specify the --protect-args (-s) option, or you'll need to escape
       the  whitespace  in  a  way that the remote shell will understand.  For
       instance:

           rsync -av host:'file\ name\ with\ spaces' /dest



CONNECTING TO AN RSYNC DAEMON

       It is also possible to use rsync without a remote shell as  the  trans-
       port.  In this case you will directly connect to a remote rsync daemon,
       typically using TCP port 873. (This obviously requires the daemon to be
       running  on the remote system, so refer to the STARTING AN RSYNC DAEMON
       TO ACCEPT CONNECTIONS section below for information on that.)

       Using rsync in this way is the same as using it  with  a  remote  shell
       except that:


       o      you  either  use  a double colon :: instead of a single colon to
              separate the hostname from the path, or you use an rsync:// URL.

       o      the first word of the "path" is actually a module name.

       o      the  remote  daemon may print a message of the day when you con-
              nect.

       o      if you specify no path name on the remote daemon then  the  list
              of accessible paths on the daemon will be shown.

       o      if you specify no local destination then a listing of the speci-
              fied files on the remote daemon is provided.

       o      you must not specify the --rsh (-e) option (since that overrides
              the  daemon connection to use ssh -- see USING RSYNC-DAEMON FEA-
              TURES VIA A REMOTE-SHELL CONNECTION below).

       An example that copies all the files in a remote module named "src":

           rsync -av host::src /dest

       Some modules on the remote daemon may require authentication.   If  so,
       you will receive a password prompt when you connect.  You can avoid the
       password prompt by setting the environment variable  RSYNC_PASSWORD  to
       the password you want to use or using the --password-file option.  This
       may be useful when scripting rsync.

       WARNING: On some systems  environment  variables  are  visible  to  all
       users.  On those systems using --password-file is recommended.

       You  may  establish the connection via a web proxy by setting the envi-
       ronment variable RSYNC_PROXY to a hostname:port pair pointing  to  your
       web proxy.  Note that your web proxy's configuration must support proxy
       connections to port 873.

       You may also establish a daemon connection using a program as  a  proxy
       by  setting the environment variable RSYNC_CONNECT_PROG to the commands
       you wish to run in place of making a  direct  socket  connection.   The
       string  may contain the escape "%H" to represent the hostname specified
       in the rsync command (so use "%%" if you need  a  single  "%"  in  your
       string).  For example:

           export RSYNC_CONNECT_PROG='ssh proxyhost nc %H 873'
           rsync -av targethost1::module/src/ /dest/
           rsync -av rsync://targethost2/module/src/ /dest/

       The command specified above uses ssh to run nc (netcat) on a proxyhost,
       which forwards all data to port 873 (the rsync daemon) on the  targeth-
       ost (%H).

       Note  also  that  if  the RSYNC_SHELL environment variable is set, that
       program will be used to run the RSYNC_CONNECT_PROG command  instead  of
       using the default shell of the system() call.



USING RSYNC-DAEMON FEATURES VIA A REMOTE-SHELL CONNECTION

       It is sometimes useful to use various features of an rsync daemon (such
       as named modules) without actually allowing any new socket  connections
       into  a  system  (other  than what is already required to allow remote-
       shell access).  Rsync supports connecting to  a  host  using  a  remote
       shell  and  then  spawning a single-use "daemon" server that expects to
       read its config file in the home dir of the remote user.  This  can  be
       useful if you want to encrypt a daemon-style transfer's data, but since
       the daemon is started up fresh by the remote user, you may not be  able
       to  use  features  such as chroot or change the uid used by the daemon.
       (For another way to encrypt a daemon transfer, consider  using  ssh  to
       tunnel  a  local  port to a remote machine and configure a normal rsync
       daemon on that remote host to only allow connections from "localhost".)

       From  the user's perspective, a daemon transfer via a remote-shell con-
       nection uses nearly the same command-line syntax as a normal rsync-dae-
       mon  transfer,  with  the only exception being that you must explicitly
       set the remote shell program on the command-line with the --rsh=COMMAND
       option. (Setting the RSYNC_RSH in the environment will not turn on this
       functionality.) For example:

           rsync -av --rsh=ssh host::module /dest

       If you need to specify a different remote-shell user, keep in mind that
       the  user@  prefix  in  front  of the host is specifying the rsync-user
       value (for a module that  requires  user-based  authentication).   This
       means  that  you  must give the '-l user' option to ssh when specifying
       the remote-shell, as in this example that uses the short version of the
       --rsh option:

           rsync -av -e "ssh -l ssh-user" rsync-user@host::module /dest

       The  "ssh-user" will be used at the ssh level; the "rsync-user" will be
       used to log-in to the "module".



STARTING AN RSYNC DAEMON TO ACCEPT CONNECTIONS

       In order to connect to an rsync daemon, the remote system needs to have
       a daemon already running (or it needs to have configured something like
       inetd to spawn an rsync daemon for incoming connections on a particular
       port).   For  full  information on how to start a daemon that will han-
       dling incoming socket connections, see the rsyncd.conf(5)  man  page --
       that  is  the  config  file  for  the  daemon, and it contains the full
       details for how to run the daemon (including stand-alone and inetd con-
       figurations).

       If  you're  using  one of the remote-shell transports for the transfer,
       there is no need to manually start an rsync daemon.



SORTED TRANSFER ORDER

       Rsync always sorts the specified filenames into its  internal  transfer
       list.  This handles the merging together of the contents of identically
       named directories, makes it easy to remove duplicate filenames, and may
       confuse  someone  when  the  files are transferred in a different order
       than what was given on the command-line.

       If you need a particular file  to  be  transferred  prior  to  another,
       either separate the files into different rsync calls, or consider using
       --delay-updates (which doesn't affect the sorted  transfer  order,  but
       does make the final file-updating phase happen much more rapidly).



EXAMPLES

       Here are some examples of how I use rsync.

       To  backup  my  wife's  home directory, which consists of large MS Word
       files and mail folders, I use a cron job that runs

           rsync -Cavz . arvidsjaur:backup

       each night over a PPP connection to a duplicate directory on my machine
       "arvidsjaur".

       To  synchronize my samba source trees I use the following Makefile tar-
       gets:

           get:
               rsync -avuzb --exclude '*~' samba:samba/ .
           put:
               rsync -Cavuzb . samba:samba/
           sync: get put

       This allows me to sync with a CVS directory at the  other  end  of  the
       connection.   I  then  do  CVS  operations on the remote machine, which
       saves a lot of time as the remote CVS protocol isn't very efficient.

       I mirror a directory between my "old" and "new" ftp sites with the com-
       mand:

           rsync -az -e ssh --delete ~ftp/pub/samba nimbus:"~ftp/pub/tridge"

       This is launched from cron every few hours.



OPTION SUMMARY

       Here  is  a  short  summary  of the options available in rsync.  Please
       refer to the detailed description below for a complete description.

       --verbose, -v            increase verbosity
       --info=FLAGS             fine-grained informational verbosity
       --debug=FLAGS            fine-grained debug verbosity
       --stderr=e|a|c           change stderr output mode (default: errors)
       --quiet, -q              suppress non-error messages
       --no-motd                suppress daemon-mode MOTD
       --checksum, -c           skip based on checksum, not mod-time & size
       --archive, -a            archive mode; equals -rlptgoD (no -H,-A,-X)
       --no-OPTION              turn off an implied OPTION (e.g. --no-D)
       --recursive, -r          recurse into directories
       --relative, -R           use relative path names
       --no-implied-dirs        don't send implied dirs with --relative
       --backup, -b             make backups (see --suffix & --backup-dir)
       --backup-dir=DIR         make backups into hierarchy based in DIR
       --suffix=SUFFIX          backup suffix (default ~ w/o --backup-dir)
       --update, -u             skip files that are newer on the receiver
       --inplace                update destination files in-place
       --append                 append data onto shorter files
       --append-verify          --append w/old data in file checksum
       --dirs, -d               transfer directories without recursing
       --mkpath                 create the destination's path component
       --links, -l              copy symlinks as symlinks
       --copy-links, -L         transform symlink into referent file/dir
       --copy-unsafe-links      only "unsafe" symlinks are transformed
       --safe-links             ignore symlinks that point outside the tree
       --munge-links            munge symlinks to make them safe & unusable
       --copy-dirlinks, -k      transform symlink to dir into referent dir
       --keep-dirlinks, -K      treat symlinked dir on receiver as dir
       --hard-links, -H         preserve hard links
       --perms, -p              preserve permissions
       --fileflags              preserve file-flags (aka chflags)
       --executability, -E      preserve executability
       --chmod=CHMOD            affect file and/or directory permissions
       --acls, -A               preserve ACLs (implies --perms)
       --xattrs, -X             preserve extended attributes
       --owner, -o              preserve owner (super-user only)
       --group, -g              preserve group
       --devices                preserve device files (super-user only)
       --specials               preserve special files
       -D                       same as --devices --specials
       --times, -t              preserve modification times
       --atimes, -U             preserve access (use) times
       --open-noatime           avoid changing the atime on opened files
       --crtimes, -N            preserve create times (newness)
       --omit-dir-times, -O     omit directories from --times
       --omit-link-times, -J    omit symlinks from --times
       --super                  receiver attempts super-user activities
       --fake-super             store/recover privileged attrs using xattrs
       --sparse, -S             turn sequences of nulls into sparse blocks
       --preallocate            allocate dest files before writing them
       --write-devices          write to devices as files (implies --inplace)
       --dry-run, -n            perform a trial run with no changes made
       --whole-file, -W         copy files whole (w/o delta-xfer algorithm)
       --checksum-choice=STR    choose the checksum algorithm (aka --cc)
       --one-file-system, -x    don't cross filesystem boundaries
       --block-size=SIZE, -B    force a fixed checksum block-size
       --rsh=COMMAND, -e        specify the remote shell to use
       --rsync-path=PROGRAM     specify the rsync to run on remote machine
       --existing               skip creating new files on receiver
       --ignore-existing        skip updating files that exist on receiver
       --remove-source-files    sender removes synchronized files (non-dir)
       --del                    an alias for --delete-during
       --delete                 delete extraneous files from dest dirs
       --delete-before          receiver deletes before xfer, not during
       --delete-during          receiver deletes during the transfer
       --delete-delay           find deletions during, delete after
       --delete-after           receiver deletes after transfer, not during
       --delete-excluded        also delete excluded files from dest dirs
       --ignore-missing-args    ignore missing source args without error
       --delete-missing-args    delete missing source args from destination
       --ignore-errors          delete even if there are I/O errors
       --force-delete           force deletion of directories even if not empty
       --force-change           affect user-/system-immutable files/dirs
       --force-uchange          affect user-immutable files/dirs
       --force-schange          affect system-immutable files/dirs
       --max-delete=NUM         don't delete more than NUM files
       --max-size=SIZE          don't transfer any file larger than SIZE
       --min-size=SIZE          don't transfer any file smaller than SIZE
       --max-alloc=SIZE         change a limit relating to memory alloc
       --partial                keep partially transferred files
       --partial-dir=DIR        put a partially transferred file into DIR
       --delay-updates          put all updated files into place at end
       --prune-empty-dirs, -m   prune empty directory chains from file-list
       --numeric-ids            don't map uid/gid values by user/group name
       --usermap=STRING         custom username mapping
       --groupmap=STRING        custom groupname mapping
       --chown=USER:GROUP       simple username/groupname mapping
       --timeout=SECONDS        set I/O timeout in seconds
       --contimeout=SECONDS     set daemon connection timeout in seconds
       --ignore-times, -I       don't skip files that match size and time
       --size-only              skip files that match in size
       --modify-window=NUM, -@  set the accuracy for mod-time comparisons
       --temp-dir=DIR, -T       create temporary files in directory DIR
       --fuzzy, -y              find similar file for basis if no dest file
       --compare-dest=DIR       also compare destination files relative to DIR
       --copy-dest=DIR          ... and include copies of unchanged files
       --link-dest=DIR          hardlink to files in DIR when unchanged
       --compress, -z           compress file data during the transfer
       --compress-choice=STR    choose the compression algorithm (aka --zc)
       --compress-level=NUM     explicitly set compression level (aka --zl)
       --skip-compress=LIST     skip compressing files with suffix in LIST
       --cvs-exclude, -C        auto-ignore files in the same way CVS does
       --filter=RULE, -f        add a file-filtering RULE
       -F                       same as --filter='dir-merge /.rsync-filter'
                                repeated: --filter='- .rsync-filter'
       --exclude=PATTERN        exclude files matching PATTERN
       --exclude-from=FILE      read exclude patterns from FILE
       --include=PATTERN        don't exclude files matching PATTERN
       --include-from=FILE      read include patterns from FILE
       --files-from=FILE        read list of source-file names from FILE
       --from0, -0              all *-from/filter files are delimited by 0s
       --protect-args, -s       no space-splitting; wildcard chars only
       --copy-as=USER[:GROUP]   specify user & optional group for the copy
       --address=ADDRESS        bind address for outgoing socket to daemon
       --port=PORT              specify double-colon alternate port number
       --sockopts=OPTIONS       specify custom TCP options
       --blocking-io            use blocking I/O for the remote shell
       --outbuf=N|L|B           set out buffering to None, Line, or Block
       --stats                  give some file-transfer stats
       --8-bit-output, -8       leave high-bit chars unescaped in output
       --human-readable, -h     output numbers in a human-readable format
       --progress               show progress during transfer
       -P                       same as --partial --progress
       --itemize-changes, -i    output a change-summary for all updates
       --remote-option=OPT, -M  send OPTION to the remote side only
       --out-format=FORMAT      output updates using the specified FORMAT
       --log-file=FILE          log what we're doing to the specified FILE
       --log-file-format=FMT    log updates using the specified FMT
       --password-file=FILE     read daemon-access password from FILE
       --early-input=FILE       use FILE for daemon's early exec input
       --list-only              list the files instead of copying them
       --bwlimit=RATE           limit socket I/O bandwidth
       --stop-after=MINS        Stop rsync after MINS minutes have elapsed
       --stop-at=y-m-dTh:m      Stop rsync at the specified point in time
       --write-batch=FILE       write a batched update to FILE
       --only-write-batch=FILE  like --write-batch but w/o updating dest
       --read-batch=FILE        read a batched update from FILE
       --protocol=NUM           force an older protocol version to be used
       --iconv=CONVERT_SPEC     request charset conversion of filenames
       --checksum-seed=NUM      set block/file checksum seed (advanced)
       --ipv4, -4               prefer IPv4
       --ipv6, -6               prefer IPv6
       --version, -V            print the version + other info and exit
       --help, -h (*)           show this help (* -h is help only on its own)

       Rsync can also be run as a daemon, in which case the following  options
       are accepted:

       --daemon                 run as an rsync daemon
       --address=ADDRESS        bind to the specified address
       --bwlimit=RATE           limit socket I/O bandwidth
       --config=FILE            specify alternate rsyncd.conf file
       --dparam=OVERRIDE, -M    override global daemon config parameter
       --no-detach              do not detach from the parent
       --port=PORT              listen on alternate port number
       --log-file=FILE          override the "log file" setting
       --log-file-format=FMT    override the "log format" setting
       --sockopts=OPTIONS       specify custom TCP options
       --verbose, -v            increase verbosity
       --ipv4, -4               prefer IPv4
       --ipv6, -6               prefer IPv6
       --help, -h               show this help (when used with --daemon)



OPTIONS

       Rsync  accepts  both long (double-dash + word) and short (single-dash +
       letter) options.  The full list of the available options are  described
       below.  If an option can be specified in more than one way, the choices
       are comma-separated.  Some options only have  a  long  variant,  not  a
       short.   If  the option takes a parameter, the parameter is only listed
       after the long variant, even though it must also be specified  for  the
       short.   When  specifying  a  parameter,  you  can  either use the form
       --option=param or replace the '=' with whitespace.  The  parameter  may
       need to be quoted in some manner for it to survive the shell's command-
       line parsing.  Keep in mind that a leading tilde (~) in a  filename  is
       substituted  by your shell, so --option=~/foo will not change the tilde
       into your home directory (remove the '=' for that).


       --help, -h (*)
              Print a short help page  describing  the  options  available  in
              rsync and exit.  (*) The -h short option will only invoke --help
              when used without other options since it normally means --human-
              readable.

       --version, -V
              Print the rsync version plus other info and exit.

              The output includes the default list of checksum algorithms, the
              default list of compression algorithms, a  list  of  compiled-in
              capabilities,   a   link   to  the  rsync  web  site,  and  some
              license/copyright info.

       --verbose, -v
              This option increases the amount of information  you  are  given
              during  the transfer.  By default, rsync works silently.  A sin-
              gle -v will give you information  about  what  files  are  being
              transferred and a brief summary at the end.  Two -v options will
              give you  information  on  what  files  are  being  skipped  and
              slightly  more information at the end.  More than two -v options
              should only be used if you are debugging rsync.

              In a modern rsync, the -v option is equivalent to the setting of
              groups  of  --info  and  --debug options.  You can choose to use
              these newer options in addition to, or in place of using  --ver-
              bose, as any fine-grained settings override the implied settings
              of -v.  Both --info and --debug have a way to ask for help  that
              tells  you  exactly what flags are set for each increase in ver-
              bosity.

              However, do keep in mind that a daemon's "max verbosity" setting
              will  limit how high of a level the various individual flags can
              be set on the daemon side.  For instance, if the max is 2,  then
              any  info  and/or  debug flag that is set to a higher value than
              what would be set by -vv will be downgraded to the -vv level  in
              the daemon's logging.

       --info=FLAGS
              This option lets you have fine-grained control over the informa-
              tion output you want to see.  An individual  flag  name  may  be
              followed  by a level number, with 0 meaning to silence that out-
              put, 1 being  the  default  output  level,  and  higher  numbers
              increasing  the  output  of  that  flag  (for those that support
              higher levels).  Use --info=help to see all the  available  flag
              names,  what they output, and what flag names are added for each
              increase in the verbose level.  Some examples:

                  rsync -a --info=progress2 src/ dest/
                  rsync -avv --info=stats2,misc1,flist0 src/ dest/

              Note that --info=name's output is affected by  the  --out-format
              and  --itemize-changes (-i) options.  See those options for more
              information on what is output and when.

              This option was added to 3.1.0, so an older rsync on the  server
              side  might reject your attempts at fine-grained control (if one
              or more flags needed to be send to the server and the server was
              too  old  to  understand  them).   See  also the "max verbosity"
              caveat above when dealing with a daemon.

       --debug=FLAGS
              This option lets you have fine-grained control  over  the  debug
              output you want to see.  An individual flag name may be followed
              by a level number, with 0 meaning  to  silence  that  output,  1
              being  the  default  output level, and higher numbers increasing
              the output of that flag (for those that support higher  levels).
              Use  --debug=help to see all the available flag names, what they
              output, and what flag names are added for each increase  in  the
              verbose level.  Some examples:

                  rsync -avvv --debug=none src/ dest/
                  rsync -avA --del --debug=del2,acl src/ dest/

              Note   that  some  debug  messages  will  only  be  output  when
              --stderr=all is specified, especially those  pertaining  to  I/O
              and buffer debugging.

              Beginning  in  3.2.0, this option is no longer auto-forwarded to
              the server side in order to allow you to specify different debug
              values  for  each  side of the transfer, as well as to specify a
              new debug option that is only present in one of the  rsync  ver-
              sions.   If you want to duplicate the same option on both sides,
              using brace expansion is an easy way to save  you  some  typing.
              This works in zsh and bash:

                  rsync -aiv {-M,}--debug=del2 src/ dest/

       --stderr=errors|all|client
              This  option  controls  which  processes output to stderr and if
              info messages are also changed to stderr.  The mode strings  can
              be  abbreviated, so feel free to use a single letter value.  The
              3 possible choices are:


              o      errors - (the default) causes all the rsync processes  to
                     send  an error directly to stderr, even if the process is
                     on the remote side of the transfer.   Info  messages  are
                     sent  to  the  client  side  via the protocol stream.  If
                     stderr is not available (i.e.  when  directly  connecting
                     with  a  daemon  via  a socket) errors fall back to being
                     sent via the protocol stream.

              o      all - causes all rsync messages (info and error)  to  get
                     written directly to stderr from all (possible) processes.
                     This causes stderr to become  line-buffered  (instead  of
                     raw) and eliminates the ability to divide up the info and
                     error messages by file handle.  For those doing debugging
                     or  using  several  levels  of verbosity, this option can
                     help to avoid clogging  up  the  transfer  stream  (which
                     should  prevent  any  chance  of  a  deadlock bug hanging
                     things up).  It also enables the outputting of  some  I/O
                     related debug messages.

              o      client  -  causes  all  rsync  messages to be sent to the
                     client side via the protocol stream.  One client  process
                     outputs all messages, with errors on stderr and info mes-
                     sages on stdout.  This was the  default  in  older  rsync
                     versions, but can cause error delays when a lot of trans-
                     fer data is ahead of the  messages.   If  you're  pushing
                     files to an older rsync, you may want to use --stderr=all
                     since that idiom has been around for several releases.

              This option was added in rsync 3.2.3.  This version  also  began
              the  forwarding  of  a  non-default  setting to the remote side,
              though rsync uses the backward-compatible options  --msgs2stderr
              and  --no-msgs2stderr  to represent the all and client settings,
              respectively.  A newer rsync will continue to accept these older
              option names to maintain compatibility.

       --quiet, -q
              This  option  decreases  the amount of information you are given
              during the transfer, notably  suppressing  information  messages
              from  the  remote  server.   This option is useful when invoking
              rsync from cron.

       --no-motd
              This option affects the information that is output by the client
              at the start of a daemon transfer.  This suppresses the message-
              of-the-day (MOTD) text, but it also affects the list of  modules
              that  the daemon sends in response to the "rsync host::" request
              (due to a limitation in the rsync protocol), so omit this option
              if you want to request the list of modules from the daemon.

       --ignore-times, -I
              Normally  rsync  will  skip  any files that are already the same
              size and have the  same  modification  timestamp.   This  option
              turns  off  this "quick check" behavior, causing all files to be
              updated.

       --size-only
              This modifies rsync's "quick check" algorithm for finding  files
              that  need  to  be  transferred, changing it from the default of
              transferring files with either a changed size or a changed last-
              modified  time  to  just  looking for files that have changed in
              size.  This is useful when starting to  use  rsync  after  using
              another  mirroring  system  which  may  not  preserve timestamps
              exactly.

       --modify-window=NUM, -@
              When comparing two timestamps, rsync treats  the  timestamps  as
              being  equal  if  they  differ by no more than the modify-window
              value.  The default is 0, which matches  just  integer  seconds.
              If  you  specify  a negative value (and the receiver is at least
              version 3.1.3) then nanoseconds will also be taken into account.
              Specifying  1  is  useful  for  copies  to/from  MS  Windows FAT
              filesystems, because FAT represents times with a 2-second  reso-
              lution  (allowing  times  to differ from the original by up to 1
              second).

              If you want all your transfers to default to comparing  nanosec-
              onds, you can create a ~/.popt file and put these lines in it:

                  rsync alias -a -a@-1
                  rsync alias -t -t@-1

              With  that  as  the default, you'd need to specify --modify-win-
              dow=0 (aka -@0) to override it and ignore nanoseconds,  e.g.  if
              you're  copying between ext3 and ext4, or if the receiving rsync
              is older than 3.1.3.

       --checksum, -c
              This changes the way rsync checks if the files have been changed
              and  are in need of a transfer.  Without this option, rsync uses
              a "quick check" that (by default) checks if each file's size and
              time of last modification match between the sender and receiver.
              This option changes this to compare a 128-bit checksum for  each
              file  that  has a matching size.  Generating the checksums means
              that both sides will expend a lot of disk I/O  reading  all  the
              data  in the files in the transfer, so this can slow things down
              significantly (and this is prior to any  reading  that  will  be
              done to transfer changed files)

              The  sending  side generates its checksums while it is doing the
              file-system scan that builds the list of  the  available  files.
              The  receiver  generates  its  checksums when it is scanning for
              changed files, and will checksum any file that has the same size
              as  the corresponding sender's file: files with either a changed
              size or a changed checksum are selected for transfer.

              Note that rsync always verifies that each transferred  file  was
              correctly  reconstructed  on  the  receiving  side by checking a
              whole-file checksum that is generated  as  the  file  is  trans-
              ferred,  but  that automatic after-the-transfer verification has
              nothing to do with this option's before-the-transfer "Does  this
              file need to be updated?" check.

              The  checksum used is auto-negotiated between the client and the
              server, but can be overridden using either the --checksum-choice
              (--cc)  option  or  an environment variable that is discussed in
              that option's section.

       --archive, -a
              This is equivalent to -rlptgoD.  It is a quick way of saying you
              want  recursion  and want to preserve almost everything (with -H
              being a notable omission).  The  only  exception  to  the  above
              equivalence  is when --files-from is specified, in which case -r
              is not implied.

              Note that -a does not preserve hardlinks, because finding multi-
              ply-linked  files is expensive.  You must separately specify -H.
              Note also that for backward compatibility, -a currently does not
              imply the --fileflags option.

       --no-OPTION
              You  may  turn  off one or more implied options by prefixing the
              option name with "no-".  Not all options may be prefixed with  a
              "no-":  only  options  that  are  implied by other options (e.g.
              --no-D, --no-perms) or have different defaults in  various  cir-
              cumstances  (e.g. --no-whole-file, --no-blocking-io, --no-dirs).
              You may specify either the short or the long option  name  after
              the "no-" prefix (e.g. --no-R is the same as --no-relative).

              For example: if you want to use -a (--archive) but don't want -o
              (--owner), instead of converting  -a  into  -rlptgD,  you  could
              specify -a --no-o (or -a --no-owner).

              The order of the options is important: if you specify --no-r -a,
              the -r option would end up being  turned  on,  the  opposite  of
              -a --no-r.   Note also that the side-effects of the --files-from
              option are NOT positional, as it affects the  default  state  of
              several  options and slightly changes the meaning of -a (see the
              --files-from option for more details).

       --recursive, -r
              This tells rsync to  copy  directories  recursively.   See  also
              --dirs (-d).

              Beginning  with rsync 3.0.0, the recursive algorithm used is now
              an incremental scan that uses much less memory than  before  and
              begins the transfer after the scanning of the first few directo-
              ries have been completed.  This incremental  scan  only  affects
              our  recursion  algorithm,  and  does not change a non-recursive
              transfer.  It is also only possible when both ends of the trans-
              fer are at least version 3.0.0.

              Some  options require rsync to know the full file list, so these
              options disable the incremental recursion mode.  These  include:
              --delete-before,    --delete-after,    --prune-empty-dirs,   and
              --delay-updates.  Because of this, the default delete mode  when
              you  specify  --delete  is now --delete-during when both ends of
              the connection are at least 3.0.0 (use --del or  --delete-during
              to  request  this  improved deletion mode explicitly).  See also
              the --delete-delay option that is a  better  choice  than  using
              --delete-after.

              Incremental  recursion can be disabled using the --no-inc-recur-
              sive option or its shorter --no-i-r alias.

       --relative, -R
              Use relative paths.  This means that the full path names  speci-
              fied on the command line are sent to the server rather than just
              the last parts of the filenames.  This  is  particularly  useful
              when  you want to send several different directories at the same
              time.  For example, if you used this command:

                  rsync -av /foo/bar/baz.c remote:/tmp/

              would create a file named baz.c in /tmp/ on the remote  machine.
              If instead you used

                  rsync -avR /foo/bar/baz.c remote:/tmp/

              then  a  file  named  /tmp/foo/bar/baz.c would be created on the
              remote machine, preserving its full path.  These extra path ele-
              ments  are  called "implied directories" (i.e. the "foo" and the
              "foo/bar" directories in the above example).

              Beginning with rsync 3.0.0, rsync  always  sends  these  implied
              directories as real directories in the file list, even if a path
              element is really a symlink on the sending side.  This  prevents
              some really unexpected behaviors when copying the full path of a
              file that you didn't realize had a symlink in its path.  If  you
              want  to  duplicate a server-side symlink, include both the sym-
              link via its path, and referent directory via its real path.  If
              you're  dealing with an older rsync on the sending side, you may
              need to use the --no-implied-dirs option.

              It is also possible to limit the amount of path information that
              is  sent as implied directories for each path you specify.  With
              a modern rsync on the sending side (beginning with  2.6.7),  you
              can insert a dot and a slash into the source path, like this:

                  rsync -avR /foo/./bar/baz.c remote:/tmp/

              That  would  create  /tmp/bar/baz.c on the remote machine. (Note
              that the dot must be followed by a slash, so "/foo/." would  not
              be abbreviated.) For older rsync versions, you would need to use
              a chdir to limit the source path.   For  example,  when  pushing
              files:

                  (cd /foo; rsync -avR bar/baz.c remote:/tmp/)

              (Note  that the parens put the two commands into a sub-shell, so
              that the "cd" command doesn't remain in effect for  future  com-
              mands.)  If  you're  pulling files from an older rsync, use this
              idiom (but only for a non-daemon transfer):

                  rsync -avR --rsync-path="cd /foo; rsync" \
                       remote:bar/baz.c /tmp/

       --no-implied-dirs
              This option affects  the  default  behavior  of  the  --relative
              option.   When  it  is  specified, the attributes of the implied
              directories from the source names are not included in the trans-
              fer.   This  means  that  the corresponding path elements on the
              destination system are left unchanged if  they  exist,  and  any
              missing implied directories are created with default attributes.
              This even allows these implied path elements to have big differ-
              ences,  such  as being a symlink to a directory on the receiving
              side.

              For instance, if a command-line arg or a files-from  entry  told
              rsync  to  transfer  the  file  "path/foo/file", the directories
              "path" and "path/foo" are implied when --relative is  used.   If
              "path/foo"  is a symlink to "bar" on the destination system, the
              receiving rsync would ordinarily delete "path/foo", recreate  it
              as  a  directory,  and  receive the file into the new directory.
              With   --no-implied-dirs,   the    receiving    rsync    updates
              "path/foo/file"  using  the  existing path elements, which means
              that the file ends up being created in "path/bar".  Another  way
              to  accomplish  this  link  preservation  is  to use the --keep-
              dirlinks option (which will also affect symlinks to  directories
              in the rest of the transfer).

              When  pulling files from an rsync older than 3.0.0, you may need
              to use this option if the sending side has a symlink in the path
              you  request  and  you wish the implied directories to be trans-
              ferred as normal directories.

       --backup, -b
              With this option, preexisting destination files are  renamed  as
              each  file is transferred or deleted.  You can control where the
              backup file goes and what (if any) suffix  gets  appended  using
              the --backup-dir and --suffix options.

              Note that if you don't specify --backup-dir, (1) the --omit-dir-
              times option will be forced on, and (2) if --delete is  also  in
              effect  (without  --delete-excluded), rsync will add a "protect"
              filter-rule for the backup suffix to the end of all your  exist-
              ing  excludes  (e.g.  -f "P *~").   This will prevent previously
              backed-up files from being deleted.  Note that if you  are  sup-
              plying  your  own  filter rules, you may need to manually insert
              your own exclude/protect rule somewhere higher up in the list so
              that  it  has  a  high enough priority to be effective (e.g., if
              your rules specify a  trailing  inclusion/exclusion  of  *,  the
              auto-added rule would never be reached).

       --backup-dir=DIR
              This  implies  the --backup option, and tells rsync to store all
              backups in the specified directory on the receiving side.   This
              can be used for incremental backups.  You can additionally spec-
              ify a backup suffix using the  --suffix  option  (otherwise  the
              files backed up in the specified directory will keep their orig-
              inal filenames).

              Note that if you specify a relative path, the  backup  directory
              will  be  relative to the destination directory, so you probably
              want to specify either an absolute path or a  path  that  starts
              with  "../".  If an rsync daemon is the receiver, the backup dir
              cannot go outside the module's path  hierarchy,  so  take  extra
              care not to delete it or copy into it.

       --suffix=SUFFIX
              This  option  allows  you  to override the default backup suffix
              used with the --backup (-b) option.  The default suffix is  a  ~
              if  no  --backup-dir  was  specified,  otherwise  it is an empty
              string.

       --update, -u
              This forces rsync to skip any files which exist on the  destina-
              tion  and  have  a  modified  time that is newer than the source
              file. (If an existing destination file has a  modification  time
              equal  to the source file's, it will be updated if the sizes are
              different.)

              Note that this does not affect the copying of dirs, symlinks, or
              other  special files.  Also, a difference of file format between
              the sender and receiver is always  considered  to  be  important
              enough for an update, no matter what date is on the objects.  In
              other words, if the source has a directory where the destination
              has  a  file,  the  transfer would occur regardless of the time-
              stamps.

              This option is a transfer rule, not an exclude,  so  it  doesn't
              affect  the  data  that  goes  into  the file-lists, and thus it
              doesn't affect deletions.  It just limits  the  files  that  the
              receiver requests to be transferred.

       --inplace
              This  option  changes  how  rsync transfers a file when its data
              needs to be updated: instead of the default method of creating a
              new  copy  of  the file and moving it into place when it is com-
              plete, rsync instead writes the updated  data  directly  to  the
              destination file.

              This has several effects:


              o      Hard  links are not broken.  This means the new data will
                     be visible through other hard links  to  the  destination
                     file.   Moreover, attempts to copy differing source files
                     onto a multiply-linked destination file will result in  a
                     "tug  of war" with the destination data changing back and
                     forth.

              o      In-use binaries cannot be updated  (either  the  OS  will
                     prevent  this from happening, or binaries that attempt to
                     swap-in their data will misbehave or crash).

              o      The file's data will be in an inconsistent  state  during
                     the transfer and will be left that way if the transfer is
                     interrupted or if an update fails.

              o      A file that rsync cannot  write  to  cannot  be  updated.
                     While  a  super  user  can update any file, a normal user
                     needs to be granted write permission for the open of  the
                     file for writing to be successful.

              o      The efficiency of rsync's delta-transfer algorithm may be
                     reduced if some data in the destination file is overwrit-
                     ten  before  it  can be copied to a position later in the
                     file.  This does not apply if  you  use  --backup,  since
                     rsync is smart enough to use the backup file as the basis
                     file for the transfer.

              WARNING: you should not use this option to update files that are
              being  accessed  by  others,  so be careful when choosing to use
              this for a copy.

              This option is useful for transferring large files  with  block-
              based  changes  or  appended  data, and also on systems that are
              disk bound, not network bound.  It can also help keep a copy-on-
              write  filesystem snapshot from diverging the entire contents of
              a file that only has minor changes.

              The option implies --partial (since an interrupted transfer does
              not  delete  the  file),  but  conflicts  with --partial-dir and
              --delay-updates.  Prior to rsync 2.6.4 --inplace was also incom-
              patible with --compare-dest and --link-dest.

       --append
              This  special  copy  mode only works to efficiently update files
              that are known to be growing larger where any  existing  content
              on  the  receiving side is also known to be the same as the con-
              tent on the sender.  The use of --append can be dangerous if you
              aren't  100% sure that all the files in the transfer are shared,
              growing files.  You should thus use filter rules to ensure  that
              you weed out any files that do not fit this criteria.

              Rsync  updates these growing file in-place without verifying any
              of the existing content in the file (it only verifies  the  con-
              tent that it is appending).  Rsync skips any files that exist on
              the receiving side that are not shorter than the associated file
              on  the  sending  side  (which  means  that new files are trasn-
              ferred).

              This does not interfere with the updating of a  file's  non-con-
              tent  attributes  (e.g.   permissions, ownership, etc.) when the
              file does not need to be transferred, nor  does  it  affect  the
              updating of any directories or non-regular files.

       --append-verify
              This  special  copy mode works like --append except that all the
              data in the file is included in the checksum verification  (mak-
              ing  it  much  less efficient but also potentially safer).  This
              option can be dangerous if you aren't 100%  sure  that  all  the
              files  in  the  transfer  are  shared,  growing  files.  See the
              --append option for more details.

              Note: prior to rsync 3.0.0,  the  --append  option  worked  like
              --append-verify,  so  if you are interacting with an older rsync
              (or the transfer is using a protocol prior  to  30),  specifying
              either  append option will initiate an --append-verify transfer.

       --dirs, -d
              Tell the sending  side  to  include  any  directories  that  are
              encountered.  Unlike --recursive, a directory's contents are not
              copied unless the directory name specified is "." or ends with a
              trailing  slash (e.g. ".", "dir/.", "dir/", etc.).  Without this
              option or the --recursive option, rsync will skip  all  directo-
              ries it encounters (and output a message to that effect for each
              one).  If you specify both --dirs and  --recursive,  --recursive
              takes precedence.

              The  --dirs  option is implied by the --files-from option or the
              --list-only option (including an implied --list-only  usage)  if
              --recursive  wasn't  specified  (so that directories are seen in
              the listing).  Specify --no-dirs (or --no-d) if you want to turn
              this off.

              There is also a backward-compatibility helper option, --old-dirs
              (or   --old-d)   that   tells   rsync   to   use   a   hack   of
              -r --exclude='/*/*'  to  get  an  older  rsync  to list a single
              directory without recursing.

       --mkpath
              Create a missing path component of the  destination  arg.   This
              allows  rsync  to  create multiple levels of missing destination
              dirs and to create a path in which to put a single renamed file.
              Keep  in mind that you'll need to supply a trailing slash if you
              want the entire destination path to be treated  as  a  directory
              when copying a single arg (making rsync behave the same way that
              it would if the path component of the  destination  had  already
              existed).

              For  example, the following creates a copy of file foo as bar in
              the sub/dir directory, creating  dirs  "sub"  and  "sub/dir"  if
              either do not yet exist:

                  rsync -ai --mkpath foo sub/dir/bar

              If you instead ran the following, it would have created file foo
              in the sub/dir/bar directory:

                  rsync -ai --mkpath foo sub/dir/bar/

       --links, -l
              When symlinks are encountered, recreate the symlink on the  des-
              tination.

       --copy-links, -L
              When  symlinks are encountered, the item that they point to (the
              referent) is copied, rather than the symlink.  In older versions
              of  rsync,  this  option also had the side-effect of telling the
              receiving side to follow symlinks, such as symlinks to  directo-
              ries.   In a modern rsync such as this one, you'll need to spec-
              ify --keep-dirlinks (-K) to get this extra behavior.   The  only
              exception  is  when sending files to an rsync that is too old to
              understand -K -- in that case, the -L option will still have the
              side-effect of -K on that older receiving rsync.

       --copy-unsafe-links
              This  tells  rsync  to  copy the referent of symbolic links that
              point outside the  copied  tree.   Absolute  symlinks  are  also
              treated  like  ordinary  files,  and  so are any symlinks in the
              source path itself when --relative is used.  This option has  no
              additional effect if --copy-links was also specified.

              Note that the cut-off point is the top of the transfer, which is
              the part of the path that rsync isn't mentioning in the  verbose
              output.  If you copy "/src/subdir" to "/dest/" then the "subdir"
              directory is a name inside the transfer tree, not the top of the
              transfer  (which  is  /src)  so it is legal for created relative
              symlinks to refer to other  names  inside  the  /src  and  /dest
              directories.   If you instead copy "/src/subdir/" (with a trail-
              ing slash) to "/dest/subdir" that would not  allow  symlinks  to
              any files outside of "subdir".

       --safe-links
              This  tells  rsync to ignore any symbolic links which point out-
              side the copied tree.  All absolute symlinks are  also  ignored.
              Using  this option in conjunction with --relative may give unex-
              pected results.

       --munge-links
              This option tells rsync  to  (1)  modify  all  symlinks  on  the
              receiving side in a way that makes them unusable but recoverable
              (see below), or (2) to unmunge symlinks on the sending side that
              had  been stored in a munged state.  This is useful if you don't
              quite trust the source of the data to not try to slip in a  sym-
              link to a unexpected place.

              The way rsync disables the use of symlinks is to prefix each one
              with the string "/rsyncd-munged/".  This prevents the links from
              being  used as long as that directory does not exist.  When this
              option is enabled, rsync will refuse to run if that  path  is  a
              directory or a symlink to a directory.

              The  option  only affects the client side of the transfer, so if
              you need it to affect  the  server,  specify  it  via  --remote-
              option.  (Note  that in a local transfer, the client side is the
              sender.)

              This option has no affect on a daemon, since the daemon  config-
              ures  whether  it wants munged symlinks via its "munge symlinks"
              parameter.  See also the "munge-symlinks"  perl  script  in  the
              support directory of the source code.

       --copy-dirlinks, -k
              This  option  causes  the  sending  side to treat a symlink to a
              directory as though it were a real directory.  This is useful if
              you  don't  want  symlinks to non-directories to be affected, as
              they would be using --copy-links.

              Without this option, if the sending side has replaced  a  direc-
              tory  with  a  symlink  to  a directory, the receiving side will
              delete anything that is in the way of the new symlink, including
              a  directory hierarchy (as long as --force-delete or --delete is
              in effect).

              See also --keep-dirlinks for an analogous option for the receiv-
              ing side.

              --copy-dirlinks  applies  to  all symlinks to directories in the
              source.  If you want to follow only a few specified symlinks,  a
              trick you can use is to pass them as additional source args with
              a trailing slash, using --relative to make the  paths  match  up
              right.  For example:

                  rsync -r --relative src/./ src/./follow-me/ dest/

              This  works  because  rsync  calls lstat(2) on the source arg as
              given, and the trailing slash makes lstat(2) follow the symlink,
              giving  rise to a directory in the file-list which overrides the
              symlink found during the scan of "src/./".

       --keep-dirlinks, -K
              This option causes the receiving side to treat a  symlink  to  a
              directory  as  though  it  were a real directory, but only if it
              matches a real directory from the sender.  Without this  option,
              the receiver's symlink would be deleted and replaced with a real
              directory.

              For example, suppose you transfer a directory  "foo"  that  con-
              tains  a  file "file", but "foo" is a symlink to directory "bar"
              on the receiver.  Without --keep-dirlinks, the receiver  deletes
              symlink  "foo",  recreates  it  as a directory, and receives the
              file into the new directory.  With --keep-dirlinks, the receiver
              keeps the symlink and "file" ends up in "bar".

              One  note of caution: if you use --keep-dirlinks, you must trust
              all the symlinks in the copy! If it is possible for an untrusted
              user  to  create  their  own  symlink to any directory, the user
              could then (on a subsequent copy) replace  the  symlink  with  a
              real  directory and affect the content of whatever directory the
              symlink references.  For backup copies, you are better off using
              something  like a bind mount instead of a symlink to modify your
              receiving hierarchy.

              See also --copy-dirlinks for an analogous option for the sending
              side.

       --hard-links, -H
              This tells rsync to look for hard-linked files in the source and
              link together the corresponding files on the destination.  With-
              out  this option, hard-linked files in the source are treated as
              though they were separate files.

              This option does NOT necessarily ensure that the pattern of hard
              links  on  the  destination  exactly matches that on the source.
              Cases in which the destination may end up with extra hard  links
              include the following:


              o      If  the  destination contains extraneous hard-links (more
                     linking than what is present in the  source  file  list),
                     the  copying  algorithm  will  not break them explicitly.
                     However, if one or more of the paths have content differ-
                     ences,  the  normal  file-update process will break those
                     extra links (unless you are using the --inplace  option).

              o      If you specify a --link-dest directory that contains hard
                     links, the linking of the destination files  against  the
                     --link-dest files can cause some paths in the destination
                     to become linked together due to the --link-dest associa-
                     tions.

              Note  that  rsync  can only detect hard links between files that
              are inside the transfer set.  If rsync updates a file  that  has
              extra  hard-link connections to files outside the transfer, that
              linkage will be broken.  If you are tempted to use the --inplace
              option to avoid this breakage, be very careful that you know how
              your files are being updated so that you  are  certain  that  no
              unintended  changes  happen due to lingering hard links (and see
              the --inplace option for more caveats).

              If incremental recursion is active (see --recursive), rsync  may
              transfer a missing hard-linked file before it finds that another
              link for that contents exists elsewhere in the hierarchy.   This
              does  not  affect the accuracy of the transfer (i.e. which files
              are hard-linked together), just its efficiency (i.e. copying the
              data for a new, early copy of a hard-linked file that could have
              been found later in the transfer in another member of the  hard-
              linked  set of files).  One way to avoid this inefficiency is to
              disable  incremental  recursion  using  the   --no-inc-recursive
              option.

       --perms, -p
              This  option  causes  the receiving rsync to set the destination
              permissions to be the same as the source permissions. (See  also
              the  --chmod  option for a way to modify what rsync considers to
              be the source permissions.)

              When this option is off, permissions are set as follows:


              o      Existing files (including  updated  files)  retain  their
                     existing  permissions,  though the --executability option
                     might change just the execute permission for the file.

              o      New files get their "normal" permission bits set  to  the
                     source  file's  permissions  masked  with  the  receiving
                     directory's default  permissions  (either  the  receiving
                     process's  umask,  or  the  permissions specified via the
                     destination directory's default ACL), and  their  special
                     permission  bits  disabled except in the case where a new
                     directory inherits a setgid bit from  its  parent  direc-
                     tory.

              Thus,  when  --perms  and  --executability  are  both  disabled,
              rsync's behavior is the same as that of other  file-copy  utili-
              ties, such as cp(1) and tar(1).

              In  summary:  to  give  destination files (both old and new) the
              source permissions, use --perms.  To give new files the destina-
              tion-default   permissions   (while   leaving   existing   files
              unchanged), make sure that the --perms option  is  off  and  use
              --chmod=ugo=rwX  (which  ensures  that  all  non-masked bits get
              enabled).  If you'd care to make this latter behavior easier  to
              type, you could define a popt alias for it, such as putting this
              line in the file ~/.popt (the following defines the  -Z  option,
              and  includes --no-g to use the default group of the destination
              dir):

                  rsync alias -Z --no-p --no-g --chmod=ugo=rwX

              You could then use this new option in a  command  such  as  this
              one:

                  rsync -avZ src/ dest/

              (Caveat:  make  sure  that -a does not follow -Z, or it will re-
              enable the two --no-* options mentioned above.)

              The preservation of the destination's setgid bit  on  newly-cre-
              ated  directories  when --perms is off was added in rsync 2.6.7.
              Older rsync versions erroneously  preserved  the  three  special
              permission  bits  for  newly-created files when --perms was off,
              while overriding the  destination's  setgid  bit  setting  on  a
              newly-created  directory.   Default  ACL observance was added to
              the ACL patch for rsync 2.6.7,  so  older  (or  non-ACL-enabled)
              rsyncs use the umask even if default ACLs are present.  (Keep in
              mind that it is the version of the receiving rsync that  affects
              these behaviors.)

       --executability, -E
              This  option causes rsync to preserve the executability (or non-
              executability) of regular files when --perms is not enabled.   A
              regular  file is considered to be executable if at least one 'x'
              is turned on in its permissions.  When an  existing  destination
              file's  executability  differs  from  that  of the corresponding
              source file, rsync modifies the destination  file's  permissions
              as follows:


              o      To  make  a  file non-executable, rsync turns off all its
                     'x' permissions.

              o      To make a file executable, rsync turns on each  'x'  per-
                     mission  that has a corresponding 'r' permission enabled.

              If --perms is enabled, this option is ignored.

       --acls, -A
              This option causes rsync to update the destination  ACLs  to  be
              the same as the source ACLs.  The option also implies --perms.

              The  source  and  destination  systems  must have compatible ACL
              entries for this option to work properly.  See the  --fake-super
              option for a way to backup and restore ACLs that are not compat-
              ible.

       --xattrs, -X
              This option causes rsync  to  update  the  destination  extended
              attributes to be the same as the source ones.

              For  systems  that support extended-attribute namespaces, a copy
              being done by a super-user copies  all  namespaces  except  sys-
              tem.*.   A  normal user only copies the user.* namespace.  To be
              able to backup and restore non-user namespaces as a normal user,
              see the --fake-super option.

              The  above name filtering can be overridden by using one or more
              filter options with the x modifier.  When you specify an  xattr-
              affecting  filter rule, rsync requires that you do your own sys-
              tem/user filtering, as well as any additional filtering for what
              xattr names are copied and what names are allowed to be deleted.
              For example, to skip the system namespace, you could specify:

                  --filter='-x system.*'

              To skip all namespaces except  the  user  namespace,  you  could
              specify a negated-user match:

                  --filter='-x! user.*'

              To  prevent any attributes from being deleted, you could specify
              a receiver-only rule that excludes all names:

                  --filter='-xr *'

              Note that the -X option does not copy rsync's special xattr val-
              ues  (e.g.   those  used  by --fake-super) unless you repeat the
              option (e.g. -XX).  This "copy all xattrs" mode cannot  be  used
              with --fake-super.

       --fileflags This option causes rsync to update the file-flags to be the
              same  as  the  source files and directories (if your OS supports
              the chflags(2) system call).   Some flags can only be altered by
              the  super-user  and  some  might  only be unset below a certain
              secure-level (usually single-user mode). It will not make  files
              alterable  that  are  set  to  immutable on the receiver.  To do
              that, see --force-change, --force-uchange, and --force-schange."

       --force-change This option causes rsync to disable both user-immutable
              and  system-immutable  flags  on  files and directories that are
              being updated or deleted on the  receiving  side.   This  option
              overrides --force-uchange and --force-schange."

       --force-uchange  This  option  causes  rsync  to disable user-immutable
       flags
              on  files  and  directories that are being updated or deleted on
              the receiving side.  It does not try  to  affect  system  flags.
              This option overrides --force-change and --force-schange."

       --force-schange This option causes rsync to disable system-immutable
              flags on files and directories that are being updated or deleted
              on the receiving side.  It does not try to  affect  user  flags.
              This option overrides --force-change and --force-uchange."

       --chmod=CHMOD
              This  option  tells  rsync  to apply one or more comma-separated
              "chmod" modes to the permission of the files  in  the  transfer.
              The resulting value is treated as though it were the permissions
              that the sending side supplied for the file,  which  means  that
              this  option  can  seem  to  have no effect on existing files if
              --perms is not enabled.

              In addition  to  the  normal  parsing  rules  specified  in  the
              chmod(1) manpage, you can specify an item that should only apply
              to a directory by prefixing it with a 'D', or  specify  an  item
              that  should  only  apply  to a file by prefixing it with a 'F'.
              For example, the following will ensure that all directories  get
              marked  set-gid, that no files are other-writable, that both are
              user-writable and group-writable, and that both have  consistent
              executability across all bits:

                  --chmod=Dg+s,ug+w,Fo-w,+X

              Using octal mode numbers is also allowed:

                  --chmod=D2775,F664

              It  is  also  legal to specify multiple --chmod options, as each
              additional option is just appended to the  list  of  changes  to
              make.

              See  the --perms and --executability options for how the result-
              ing permission value can be applied to the files in  the  trans-
              fer.

       --owner, -o
              This  option  causes  rsync  to set the owner of the destination
              file to be the same as the source file, but only if the  receiv-
              ing  rsync  is being run as the super-user (see also the --super
              and --fake-super options).  Without this option,  the  owner  of
              new and/or transferred files are set to the invoking user on the
              receiving side.

              The preservation of ownership will associate matching  names  by
              default,  but  may fall back to using the ID number in some cir-
              cumstances (see also the --numeric-ids option for a full discus-
              sion).

       --group, -g
              This  option  causes  rsync  to set the group of the destination
              file to be the same as the source file.  If the  receiving  pro-
              gram  is  not  running  as  the super-user (or if --no-super was
              specified), only groups that the invoking user on the  receiving
              side is a member of will be preserved.  Without this option, the
              group is set to the default group of the invoking  user  on  the
              receiving side.

              The  preservation  of  group information will associate matching
              names by default, but may fall back to using the  ID  number  in
              some circumstances (see also the --numeric-ids option for a full
              discussion).

       --devices
              This option causes rsync to transfer character and block  device
              files  to  the  remote  system  to recreate these devices.  This
              option has no effect if the receiving rsync is not  run  as  the
              super-user (see also the --super and --fake-super options).

       --specials
              This option causes rsync to transfer special files such as named
              sockets and fifos.

       -D     The -D option is equivalent to --devices --specials.

       --write-devices
              This tells rsync to treat a device on the receiving  side  as  a
              regular file, allowing the writing of file data into a device.

              This option implies the --inplace option.

              Be  careful  using  this,  as  you  should know what devices are
              present on the receiving side of  the  transfer,  especially  if
              running rsync as root.

              This option is refused by an rsync daemon.

       --times, -t
              This  tells  rsync to transfer modification times along with the
              files and update them on the remote system.  Note that  if  this
              option  is  not  used, the optimization that excludes files that
              have not been modified cannot be effective; in  other  words,  a
              missing -t or -a will cause the next transfer to behave as if it
              used -I, causing all files to be updated (though rsync's  delta-
              transfer  algorithm will make the update fairly efficient if the
              files haven't actually changed, you're  much  better  off  using
              -t).

       --atimes, -U
              This  tells  rsync to set the access (use) times of the destina-
              tion files to the same value as the source files.

              If repeated, it also sets the --open-noatime option,  which  can
              help you to make the sending and receiving systems have the same
              access times on the transferred files  without  needing  to  run
              rsync an extra time after a file is transferred.

              Note  that  some  older rsync versions (prior to 3.2.0) may have
              been built with a pre-release --atimes patch that does not imply
              --open-noatime when this option is repeated.

       --open-noatime
              This  tells rsync to open files with the O_NOATIME flag (on sys-
              tems that support it) to avoid changing the access time  of  the
              files  that  are being transferred.  If your OS does not support
              the O_NOATIME flag then rsync will silently ignore this  option.
              Note  also  that  some filesystems are mounted to avoid updating
              the atime on read access even without the O_NOATIME  flag  being
              set.

       --crtimes, -N,
              This tells rsync to set the create times (newness) of the desti-
              nation files to the same value as the source files.

       --omit-dir-times, -O
              This tells rsync to omit directories when it is preserving modi-
              fication times (see --times).  If NFS is sharing the directories
              on the receiving side, it is a good idea to use -O.  This option
              is inferred if you use --backup without --backup-dir.

              This  option also has the side-effect of avoiding early creation
              of directories in incremental  recursion  copies.   The  default
              --inc-recursive  copying  normally  does an early-create pass of
              all the sub-directories in a parent directory in order for it to
              be  able  to  then  set  the modify time of the parent directory
              right away (without having to delay that until a bunch of recur-
              sive copying has finished).  This early-create idiom is not nec-
              essary if directory modify times are not being preserved, so  it
              is  skipped.  Since early-create directories don't have accurate
              mode, mtime, or ownership, the use of this option can help  when
              someone wants to avoid these partially-finished directories.

       --omit-link-times, -J
              This  tells rsync to omit symlinks when it is preserving modifi-
              cation times (see --times).

       --super
              This tells the receiving side to attempt  super-user  activities
              even if the receiving rsync wasn't run by the super-user.  These
              activities include: preserving users  via  the  --owner  option,
              preserving  all  groups (not just the current user's groups) via
              the --groups option,  and  copying  devices  via  the  --devices
              option.   This  is useful for systems that allow such activities
              without being the super-user, and also  for  ensuring  that  you
              will  get  errors  if  the receiving side isn't being run as the
              super-user.  To turn off super-user activities,  the  super-user
              can use --no-super.

       --fake-super
              When  this option is enabled, rsync simulates super-user activi-
              ties by saving/restoring the privileged attributes  via  special
              extended  attributes that are attached to each file (as needed).
              This includes the file's owner and  group  (if  it  is  not  the
              default),  the  file's  device  info (device & special files are
              created as empty text files), and any permission  bits  that  we
              won't  allow to be set on the real file (e.g. the real file gets
              u-s,g-s,o-t for safety) or that would limit the  owner's  access
              (since  the real super-user can always access/change a file, the
              files we create can always be accessed/changed by  the  creating
              user).   This option also handles ACLs (if --acls was specified)
              and non-user extended attributes (if --xattrs was specified).

              This is a good way to backup data without  using  a  super-user,
              and to store ACLs from incompatible systems.

              The  --fake-super  option only affects the side where the option
              is used.  To affect the remote side of  a  remote-shell  connec-
              tion, use the --remote-option (-M) option:

                  rsync -av -M--fake-super /src/ host:/dest/

              For  a  local  copy, this option affects both the source and the
              destination.  If you wish a local copy  to  enable  this  option
              just  for the destination files, specify -M--fake-super.  If you
              wish a local copy to enable this  option  just  for  the  source
              files, combine --fake-super with -M--super.

              This option is overridden by both --super and --no-super.

              See  also  the  "fake super" setting in the daemon's rsyncd.conf
              file.

       --sparse, -S
              Try to handle sparse files efficiently  so  they  take  up  less
              space  on  the destination.  If combined with --inplace the file
              created might not end up with sparse blocks with  some  combina-
              tions of kernel version and/or filesystem type.  If --whole-file
              is in effect (e.g. for a local copy) then it  will  always  work
              because  rsync  truncates  the  file  prior  to  writing out the
              updated version.

              Note that versions of rsync older than  3.1.3  will  reject  the
              combination of --sparse and --inplace.

       --preallocate
              This tells the receiver to allocate each destination file to its
              eventual size before writing data to the file.  Rsync will  only
              use  the real filesystem-level preallocation support provided by
              Linux's fallocate(2) system call or Cygwin's posix_fallocate(3),
              not  the  slow glibc implementation that writes a null byte into
              each block.

              Without this option, larger files may not be entirely contiguous
              on the filesystem, but with this option rsync will probably copy
              more slowly.  If the destination  is  not  an  extent-supporting
              filesystem (such as ext4, xfs, NTFS, etc.), this option may have
              no positive effect at all.

              If combined with --sparse, the file will only have sparse blocks
              (as  opposed to allocated sequences of null bytes) if the kernel
              version and filesystem type support creating holes in the  allo-
              cated data.

       --dry-run, -n
              This  makes  rsync  perform  a  trial  run that doesn't make any
              changes (and produces mostly the same output as a real run).  It
              is  most  commonly  used  in  combination with the --verbose, -v
              and/or --itemize-changes, -i options to see what an  rsync  com-
              mand is going to do before one actually runs it.

              The  output  of  --itemize-changes is supposed to be exactly the
              same on a dry run and a subsequent real run (barring intentional
              trickery  and  system call failures); if it isn't, that's a bug.
              Other output should be mostly unchanged, but may differ in  some
              areas.   Notably,  a  dry  run does not send the actual data for
              file transfers, so --progress has no effect, the  "bytes  sent",
              "bytes  received", "literal data", and "matched data" statistics
              are too small, and the "speedup" value is equivalent  to  a  run
              where no file transfers were needed.

       --whole-file, -W
              This  option  disables  rsync's  delta-transfer algorithm, which
              causes all transferred files to be sent whole.  The transfer may
              be  faster if this option is used when the bandwidth between the
              source and destination machines is higher than the bandwidth  to
              disk  (especially  when  the  "disk"  is  actually  a  networked
              filesystem).  This is the default when both the source and  des-
              tination  are  specified  as  local paths, but only if no batch-
              writing option is in effect.

       --checksum-choice=STR, --cc=STR
              This option overrides the checksum algorithms.  If one algorithm
              name  is  specified,  it is used for both the transfer checksums
              and (assuming --checksum is specified) the  pre-transfer  check-
              sums.  If two comma-separated names are supplied, the first name
              affects the transfer checksums, and the second name affects  the
              pre-transfer checksums (-c).

              The checksum options that you may be able to use are:


              o      auto (the default automatic choice)

              o      xxh128

              o      xxh3

              o      xxh64 (aka xxhash)

              o      md5

              o      md4

              o      none

              Run  rsync --version  to  see the default checksum list compiled
              into your version (which may differ from the list above).

              If "none" is  specified  for  the  first  (or  only)  name,  the
              --whole-file option is forced on and no checksum verification is
              performed on the transferred data.  If "none" is  specified  for
              the second (or only) name, the --checksum option cannot be used.

              The "auto" option is the default, where rsync  bases  its  algo-
              rithm  choice on a negotiation between the client and the server
              as follows:

              When both sides of  the  transfer  are  at  least  3.2.0,  rsync
              chooses the first algorithm in the client's list of choices that
              is also in the server's list of choices.  If no common  checksum
              choice is found, rsync exits with an error.  If the remote rsync
              is too old to support checksum negotiation, a  value  is  chosen
              based  on  the  protocol  version (which chooses between MD5 and
              various flavors of MD4 based on protocol age).

              The default order can be customized by setting  the  environment
              variable   RSYNC_CHECKSUM_LIST  to  a  space-separated  list  of
              acceptable checksum names.  If the string contains a "&" charac-
              ter,  it  is separated into the "client string & server string",
              otherwise the same string applies to both.  If  the  string  (or
              string  portion)  contains  no  non-whitespace  characters,  the
              default checksum list is used.  This method does not  allow  you
              to  specify the transfer checksum separately from the pre-trans-
              fer checksum, and it discards "auto" and  all  unknown  checksum
              names.  A list with only invalid names results in a failed nego-
              tiation.

              The use of the --checksum-choice option overrides this  environ-
              ment list.

       --one-file-system, -x
              This  tells  rsync  to avoid crossing a filesystem boundary when
              recursing.  This does not limit the user's  ability  to  specify
              items  to copy from multiple filesystems, just rsync's recursion
              through the hierarchy of each directory that the user specified,
              and  also  the  analogous recursion on the receiving side during
              deletion.  Also keep in mind that rsync treats a "bind" mount to
              the same device as being on the same filesystem.

              If this option is repeated, rsync omits all mount-point directo-
              ries from the copy.  Otherwise, it includes an  empty  directory
              at  each  mount-point it encounters (using the attributes of the
              mounted directory because those of  the  underlying  mount-point
              directory are inaccessible).

              If rsync has been told to collapse symlinks (via --copy-links or
              --copy-unsafe-links), a symlink to a directory on another device
              is  treated like a mount-point.  Symlinks to non-directories are
              unaffected by this option.

       --existing, --ignore-non-existing
              This tells rsync to skip creating files (including  directories)
              that  do  not  exist  yet on the destination.  If this option is
              combined with the --ignore-existing option,  no  files  will  be
              updated  (which  can  be  useful if all you want to do is delete
              extraneous files).

              This option is a transfer rule, not an exclude,  so  it  doesn't
              affect  the  data  that  goes  into  the file-lists, and thus it
              doesn't affect deletions.  It just limits  the  files  that  the
              receiver requests to be transferred.

       --ignore-existing
              This  tells  rsync  to skip updating files that already exist on
              the destination (this does not ignore existing  directories,  or
              nothing would get done).  See also --existing.

              This  option  is  a transfer rule, not an exclude, so it doesn't
              affect the data that goes  into  the  file-lists,  and  thus  it
              doesn't  affect  deletions.   It  just limits the files that the
              receiver requests to be transferred.

              This option can be useful for  those  doing  backups  using  the
              --link-dest  option when they need to continue a backup run that
              got interrupted.  Since a --link-dest run is copied into  a  new
              directory  hierarchy (when it is used properly), using --ignore-
              existing will ensure that the already-handled  files  don't  get
              tweaked (which avoids a change in permissions on the hard-linked
              files).  This does mean that this option is only looking at  the
              existing files in the destination hierarchy itself.

       --remove-source-files
              This  tells  rsync  to  remove  from  the sending side the files
              (meaning non-directories) that are a part of  the  transfer  and
              have been successfully duplicated on the receiving side.

              Note  that  you should only use this option on source files that
              are quiescent.  If you are using this to move files that show up
              in  a  particular directory over to another host, make sure that
              the finished files get renamed into the  source  directory,  not
              directly  written into it, so that rsync can't possibly transfer
              a file that is not yet fully written.  If you can't first  write
              the  files  into  a different directory, you should use a naming
              idiom that lets rsync avoid transferring files that are not  yet
              finished  (e.g.  name  the  file  "foo.new"  when it is written,
              rename it to "foo" when it is done,  and  then  use  the  option
              --exclude='*.new' for the rsync transfer).

              Starting  with  3.1.0,  rsync  will skip the sender-side removal
              (and output an error) if the file's size or modify time has  not
              stayed unchanged.

       --delete
              This  tells  rsync to delete extraneous files from the receiving
              side (ones that aren't on the sending side), but  only  for  the
              directories  that  are  being synchronized.  You must have asked
              rsync to send the whole directory (e.g. "dir" or "dir/") without
              using  a  wildcard  for  the directory's contents (e.g. "dir/*")
              since the wildcard is expanded by the shell and rsync thus  gets
              a  request  to  transfer individual files, not the files' parent
              directory.  Files that are excluded from the transfer  are  also
              excluded from being deleted unless you use the --delete-excluded
              option or mark the rules as only matching on  the  sending  side
              (see the include/exclude modifiers in the FILTER RULES section).

              Prior to rsync 2.6.7, this option would have  no  effect  unless
              --recursive  was  enabled.  Beginning with 2.6.7, deletions will
              also occur when --dirs (-d) is enabled, but only for directories
              whose contents are being copied.

              This  option  can be dangerous if used incorrectly! It is a very
              good idea to first try a run using the --dry-run option (-n)  to
              see what files are going to be deleted.

              If the sending side detects any I/O errors, then the deletion of
              any files at the destination  will  be  automatically  disabled.
              This  is  to  prevent temporary filesystem failures (such as NFS
              errors) on the sending side from causing a massive  deletion  of
              files  on  the  destination.   You  can  override  this with the
              --ignore-errors option.

              The --delete option may be combined with one  of  the  --delete-
              WHEN  options  without  conflict,  as well as --delete-excluded.
              However, if none of the  --delete-WHEN  options  are  specified,
              rsync  will choose the --delete-during algorithm when talking to
              rsync 3.0.0 or newer, and  the  --delete-before  algorithm  when
              talking   to  an  older  rsync.   See  also  --delete-delay  and
              --delete-after.

       --delete-before
              Request that the file-deletions on the receiving  side  be  done
              before the transfer starts.  See --delete (which is implied) for
              more details on file-deletion.

              Deleting before the transfer is helpful  if  the  filesystem  is
              tight for space and removing extraneous files would help to make
              the transfer possible.   However,  it  does  introduce  a  delay
              before the start of the transfer, and this delay might cause the
              transfer to timeout  (if  --timeout  was  specified).   It  also
              forces rsync to use the old, non-incremental recursion algorithm
              that requires rsync to scan all the files in the  transfer  into
              memory at once (see --recursive).

       --delete-during, --del
              Request  that  the  file-deletions on the receiving side be done
              incrementally as the transfer happens.  The per-directory delete
              scan is done right before each directory is checked for updates,
              so it behaves like a more efficient  --delete-before,  including
              doing  the  deletions  prior  to  any per-directory filter files
              being updated.  This option was first  added  in  rsync  version
              2.6.4.   See  --delete  (which  is  implied) for more details on
              file-deletion.

       --delete-delay
              Request that the file-deletions on the receiving  side  be  com-
              puted  during  the  transfer  (like  --delete-during),  and then
              removed after the transfer completes.  This is useful when  com-
              bined with --delay-updates and/or --fuzzy, and is more efficient
              than using --delete-after (but  can  behave  differently,  since
              --delete-after  computes  the deletions in a separate pass after
              all updates are done).  If the number of removed files overflows
              an  internal  buffer,  a  temporary  file will be created on the
              receiving side to hold the names (it is removed while  open,  so
              you  shouldn't  see it during the transfer).  If the creation of
              the temporary file fails, rsync will try to fall back  to  using
              --delete-after  (which  it  cannot do if --recursive is doing an
              incremental scan).  See --delete (which  is  implied)  for  more
              details on file-deletion.

       --delete-after
              Request  that  the  file-deletions on the receiving side be done
              after the transfer has completed.  This is  useful  if  you  are
              sending  new per-directory merge files as a part of the transfer
              and you want their exclusions to  take  effect  for  the  delete
              phase  of the current transfer.  It also forces rsync to use the
              old, non-incremental recursion algorithm that requires rsync  to
              scan  all  the  files  in  the transfer into memory at once (see
              --recursive). See --delete (which is implied) for  more  details
              on file-deletion.

       --delete-excluded
              In addition to deleting the files on the receiving side that are
              not on the sending side, this tells rsync  to  also  delete  any
              files  on  the receiving side that are excluded (see --exclude).
              See the FILTER RULES section for a way to make individual exclu-
              sions  behave this way on the receiver, and for a way to protect
              files from --delete-excluded.  See --delete (which  is  implied)
              for more details on file-deletion.

       --ignore-missing-args
              When  rsync  is first processing the explicitly requested source
              files (e.g.  command-line arguments or --files-from entries), it
              is  normally  an error if the file cannot be found.  This option
              suppresses that error, and does not try to  transfer  the  file.
              This  does  not affect subsequent vanished-file errors if a file
              was initially found to be present and later is no longer  there.

       --delete-missing-args
              This  option  takes the behavior of (the implied) --ignore-miss-
              ing-args option a step farther: each missing arg will  become  a
              deletion  request  of  the corresponding destination file on the
              receiving side (should it exist).  If the destination file is  a
              non-empty  directory,  it  will  only be successfully deleted if
              --force-delete or --delete are in effect.  Other than that, this
              option is independent of any other type of delete processing.

              The  missing  source  files are represented by special file-list
              entries which display as a "*missing" entry in  the  --list-only
              output.

       --ignore-errors
              Tells  --delete to go ahead and delete files even when there are
              I/O errors.

       --force-delete
              This option tells rsync to delete a non-empty directory when  it
              is  to be replaced by a non-directory.  This is only relevant if
              deletions are not active (see --delete for details).

              This option can be abbreviated --force for backward  compatibil-
              ity.   Note that some older rsync versions used to still require
              --force when using --delete-after, and it used to  be  non-func-
              tional unless the --recursive option was also enabled.

       --max-delete=NUM
              This  tells  rsync not to delete more than NUM files or directo-
              ries.  If that limit is  exceeded,  all  further  deletions  are
              skipped through the end of the transfer.  At the end, rsync out-
              puts a warning (including a count of the skipped deletions)  and
              exits with an error code of 25 (unless some more important error
              condition also occurred).

              Beginning with version 3.0.0, you may specify --max-delete=0  to
              be  warned about any extraneous files in the destination without
              removing any of them.  Older clients interpreted this as "unlim-
              ited",  so if you don't know what version the client is, you can
              use the less obvious --max-delete=-1  as  a  backward-compatible
              way  to  specify that no deletions be allowed (though really old
              versions didn't warn when the limit was exceeded).

       --max-size=SIZE
              This tells rsync to avoid transferring any file that  is  larger
              than the specified SIZE.  A numeric value can be suffixed with a
              string to indicate the numeric  units  or  left  unqualified  to
              specify  bytes.   Feel free to use a fractional value along with
              the units, such as --max-size=1.5m.

              This option is a transfer rule, not an exclude,  so  it  doesn't
              affect  the  data  that  goes  into  the file-lists, and thus it
              doesn't affect deletions.  It just limits  the  files  that  the
              receiver requests to be transferred.

              The first letter of a units string can be B (bytes), K (kilo), M
              (mega), G (giga), T (tera), or P (peta).  If  the  string  is  a
              single char or has "ib" added to it (e.g. "G" or "GiB") then the
              units are multiples of 1024.  If you  use  a  two-letter  suffix
              that  ends  with  a  "B" (e.g. "kb") then you get units that are
              multiples of 1000.  The string's letters can be any mix of upper
              and lower-case that you want to use.

              Finally, if the string ends with either "+1" or "-1", it is off-
              set by one byte in the indicated direction.  The largest  possi-
              ble value is usually 8192P-1.

              Examples:   --max-size=1.5mb-1  is  1499999  bytes,  and  --max-
              size=2g+1 is 2147483649 bytes.

              Note that rsync versions prior to 3.1.0  did  not  allow  --max-
              size=0.

       --min-size=SIZE
              This  tells rsync to avoid transferring any file that is smaller
              than the specified SIZE, which  can  help  in  not  transferring
              small,  junk files.  See the --max-size option for a description
              of SIZE and other information.

              Note that rsync versions prior to 3.1.0  did  not  allow  --min-
              size=0.

       --max-alloc=SIZE
              By  default  rsync  limits an individual malloc/realloc to about
              1GB in size.  For most people this limit  works  just  fine  and
              prevents  a  protocol  error  causing  rsync  to request massive
              amounts of memory.  However, if you have many millions of  files
              in  a  transfer,  a large amount of server memory, and you don't
              want to split up your transfer  into  multiple  parts,  you  can
              increase  the per-allocation limit to something larger and rsync
              will consume more memory.

              Keep in mind that this is not a limit on the total size of allo-
              cated  memory.   It  is a sanity-check value for each individual
              allocation.

              See the --max-size option for a description of how SIZE  can  be
              specified.  The default suffix if none is given is bytes.

              Beginning in 3.2.3, a value of 0 specifies no limit.

              You  can  set  a  default  value  using the environment variable
              RSYNC_MAX_ALLOC using the same SIZE values as supported by  this
              option.   If the remote rsync doesn't understand the --max-alloc
              option, you can override an environmental  value  by  specifying
              --max-alloc=1g,  which  will make rsync avoid sending the option
              to the remote side (because "1G" is the default).

       --block-size=SIZE, -B
              This forces the block size used in rsync's delta-transfer  algo-
              rithm  to  a  fixed value.  It is normally selected based on the
              size of each file being updated.  See the technical  report  for
              details.

              Beginning  in  3.2.3  the SIZE can be specified with a suffix as
              detailed in the --max-size option.  Older versions only accepted
              a byte count.

       --rsh=COMMAND, -e
              This  option  allows  you  to choose an alternative remote shell
              program to use for communication between the  local  and  remote
              copies  of  rsync.  Typically, rsync is configured to use ssh by
              default, but you may prefer to use rsh on a local network.

              If this option is used with [user@]host::module/path,  then  the
              remote  shell COMMAND will be used to run an rsync daemon on the
              remote host, and all  data  will  be  transmitted  through  that
              remote  shell  connection,  rather  than through a direct socket
              connection to a running rsync daemon on the  remote  host.   See
              the section "USING RSYNC-DAEMON FEATURES VIA A REMOTE-SHELL CON-
              NECTION" above.

              Beginning with rsync 3.2.0, the RSYNC_PORT environment  variable
              will be set when a daemon connection is being made via a remote-
              shell connection.  It is set to 0 if the default daemon port  is
              being  assumed, or it is set to the value of the rsync port that
              was specified via either the --port option or a  non-empty  port
              value  in an rsync:// URL.  This allows the script to discern if
              a non-default port is being requested, allowing for things  such
              as  an  SSL  or stunnel helper script to connect to a default or
              alternate port.

              Command-line arguments are permitted in  COMMAND  provided  that
              COMMAND  is  presented  to rsync as a single argument.  You must
              use spaces (not tabs or other whitespace) to separate  the  com-
              mand  and  args  from each other, and you can use single- and/or
              double-quotes to preserve spaces in an argument (but  not  back-
              slashes).   Note  that  doubling a single-quote inside a single-
              quoted string gives you a  single-quote;  likewise  for  double-
              quotes  (though  you  need to pay attention to which quotes your
              shell is parsing and which quotes rsync is parsing).  Some exam-
              ples:

                  -e 'ssh -p 2234'
                  -e 'ssh -o "ProxyCommand nohup ssh firewall nc -w1 %h %p"'

              (Note  that  ssh  users  can alternately customize site-specific
              connect options in their .ssh/config file.)

              You can also choose the remote shell program using the RSYNC_RSH
              environment  variable, which accepts the same range of values as
              -e.

              See also the --blocking-io option  which  is  affected  by  this
              option.

       --rsync-path=PROGRAM
              Use  this  to  specify  what  program is to be run on the remote
              machine to start-up rsync.  Often used when rsync is not in  the
              default       remote-shell's       path      (e.g.      --rsync-
              path=/usr/local/bin/rsync).  Note that PROGRAM is run  with  the
              help  of  a  shell, so it can be any program, script, or command
              sequence you'd care to run, so long as it does not  corrupt  the
              standard-in & standard-out that rsync is using to communicate.

              One  tricky  example  is to set a different default directory on
              the remote machine for use  with  the  --relative  option.   For
              instance:

                  rsync -avR --rsync-path="cd /a/b && rsync" host:c/d /e/

       --remote-option=OPTION, -M
              This  option is used for more advanced situations where you want
              certain effects to be limited to one side of the transfer  only.
              For  instance,  if  you want to pass --log-file=FILE and --fake-
              super to the remote system, specify it like this:

                  rsync -av -M --log-file=foo -M--fake-super src/ dest/

              If you want to have an option affect only the local  side  of  a
              transfer  when it normally affects both sides, send its negation
              to the remote side.  Like this:

                  rsync -av -x -M--no-x src/ dest/

              Be cautious using this, as it is possible to  toggle  an  option
              that  will  cause rsync to have a different idea about what data
              to expect next over the socket, and that will make it fail in  a
              cryptic fashion.

              Note  that it is best to use a separate --remote-option for each
              option you want to pass.  This makes your usage compatible  with
              the --protect-args option.  If that option is off, any spaces in
              your remote options will be split by the remote shell unless you
              take steps to protect them.

              When performing a local transfer, the "local" side is the sender
              and the "remote" side is the receiver.

              Note some versions of the popt option-parsing library have a bug
              in  them  that  prevents  you from using an adjacent arg with an
              equal in it  next  to  a  short  option  letter  (e.g.  -M--log-
              file=/tmp/foo).   If  this bug affects your version of popt, you
              can use the version of popt that is included with rsync.

       --cvs-exclude, -C
              This is a useful shorthand for excluding a broad range of  files
              that  you often don't want to transfer between systems.  It uses
              a similar algorithm to CVS to determine  if  a  file  should  be
              ignored.

              The  exclude  list is initialized to exclude the following items
              (these initial items are marked as perishable -- see the  FILTER
              RULES section):

                  RCS  SCCS CVS CVS.adm RCSLOG cvslog.*  tags TAGS .make.state
                  .nse_depinfo *~ #* .#* ,* _$* *$ *.old  *.bak  *.BAK  *.orig
                  *.rej  .del-*  *.a *.olb *.o *.obj *.so *.exe *.Z *.elc *.ln
                  core .svn/ .git/ .hg/ .bzr/

              then, files listed in a $HOME/.cvsignore are added to  the  list
              and  any files listed in the CVSIGNORE environment variable (all
              cvsignore names are delimited by whitespace).

              Finally, any file is ignored if it is in the same directory as a
              .cvsignore  file and matches one of the patterns listed therein.
              Unlike rsync's filter/exclude files, these patterns are split on
              whitespace.  See the cvs(1) manual for more information.

              If  you're combining -C with your own --filter rules, you should
              note that these CVS excludes are appended at the end of your own
              rules,  regardless  of  where  the -C was placed on the command-
              line.  This makes them a lower priority than any rules you spec-
              ified  explicitly.   If  you  want  to  control  where these CVS
              excludes get inserted into your filter rules,  you  should  omit
              the  -C as a command-line option and use a combination of --fil-
              ter=:C and  --filter=-C  (either  on  your  command-line  or  by
              putting  the  ":C"  and  "-C" rules into a filter file with your
              other rules).  The first option turns on the per-directory scan-
              ning for the .cvsignore file.  The second option does a one-time
              import of the CVS excludes mentioned above.

       --filter=RULE, -f
              This option allows you to add rules to selectively exclude  cer-
              tain  files  from  the list of files to be transferred.  This is
              most useful in combination with a recursive transfer.

              You may use as many --filter options on the command line as  you
              like  to  build  up the list of files to exclude.  If the filter
              contains whitespace, be sure to quote it so that the shell gives
              the  rule  to  rsync  as a single argument.  The text below also
              mentions that you can use an underscore  to  replace  the  space
              that separates a rule from its arg.

              See  the  FILTER  RULES section for detailed information on this
              option.

       -F     The -F option is a shorthand for adding two  --filter  rules  to
              your command.  The first time it is used is a shorthand for this
              rule:

                  --filter='dir-merge /.rsync-filter'

              This tells rsync to look for per-directory  .rsync-filter  files
              that  have  been  sprinkled  through the hierarchy and use their
              rules to filter the files in the transfer.  If -F  is  repeated,
              it is a shorthand for this rule:

                  --filter='exclude .rsync-filter'

              This  filters  out  the  .rsync-filter files themselves from the
              transfer.

              See the FILTER RULES section for  detailed  information  on  how
              these options work.

       --exclude=PATTERN
              This  option  is  a  simplified form of the --filter option that
              defaults to an exclude rule and does not allow  the  full  rule-
              parsing syntax of normal filter rules.

              See  the  FILTER  RULES section for detailed information on this
              option.

       --exclude-from=FILE
              This option is related to the --exclude option, but it specifies
              a  FILE  that  contains  exclude patterns (one per line).  Blank
              lines in the file  and  lines  starting  with  ';'  or  '#'  are
              ignored.   If  FILE  is '-', the list will be read from standard
              input.

       --include=PATTERN
              This option is a simplified form of  the  --filter  option  that
              defaults  to  an  include rule and does not allow the full rule-
              parsing syntax of normal filter rules.

              See the FILTER RULES section for detailed  information  on  this
              option.

       --include-from=FILE
              This option is related to the --include option, but it specifies
              a FILE that contains include patterns  (one  per  line).   Blank
              lines  in  the  file  and  lines  starting  with  ';' or '#' are
              ignored.  If FILE is '-', the list will be  read  from  standard
              input.

       --files-from=FILE
              Using  this option allows you to specify the exact list of files
              to transfer (as read from the specified FILE or '-' for standard
              input).   It  also  tweaks the default behavior of rsync to make
              transferring just the specified files and directories easier:


              o      The --relative (-R) option is  implied,  which  preserves
                     the  path  information that is specified for each item in
                     the file (use --no-relative or --no-R if you want to turn
                     that off).

              o      The  --dirs  (-d)  option  is  implied, which will create
                     directories specified in  the  list  on  the  destination
                     rather than noisily skipping them (use --no-dirs or --no-
                     d if you want to turn that off).

              o      The --archive  (-a)  option's  behavior  does  not  imply
                     --recursive  (-r),  so specify it explicitly, if you want
                     it.

              o      These side-effects change the default state of rsync,  so
                     the  position  of the --files-from option on the command-
                     line has no bearing on how other options are parsed (e.g.
                     -a  works  the same before or after --files-from, as does
                     --no-R and all other options).

              The filenames that are read from the FILE are  all  relative  to
              the  source  dir --  any leading slashes are removed and no ".."
              references are allowed to go higher than the  source  dir.   For
              example, take this command:

                  rsync -a --files-from=/tmp/foo /usr remote:/backup

              If  /tmp/foo  contains  the  string  "bin" (or even "/bin"), the
              /usr/bin directory will be created as /backup/bin on the  remote
              host.   If  it  contains  "bin/"  (note the trailing slash), the
              immediate contents of the directory would also be sent  (without
              needing  to be explicitly mentioned in the file -- this began in
              version 2.6.4).  In both cases, if the -r  option  was  enabled,
              that  dir's  entire hierarchy would also be transferred (keep in
              mind that -r needs to be specified explicitly with --files-from,
              since  it  is  not implied by -a).  Also note that the effect of
              the (enabled by default) --relative option is to duplicate  only
              the  path  info  that is read from the file -- it does not force
              the duplication of the source-spec path (/usr in this case).

              In addition, the --files-from file can be read from  the  remote
              host instead of the local host if you specify a "host:" in front
              of the file (the host must match one end of the transfer).  As a
              short-cut, you can specify just a prefix of ":" to mean "use the
              remote end of the transfer".  For example:

                  rsync -a --files-from=:/path/file-list src:/ /tmp/copy

              This would copy all the files specified in  the  /path/file-list
              file that was located on the remote "src" host.

              If  the --iconv and --protect-args options are specified and the
              --files-from filenames are being sent from one host to  another,
              the filenames will be translated from the sending host's charset
              to the receiving host's charset.

              NOTE: sorting the list of files in the --files-from input  helps
              rsync  to  be  more  efficient, as it will avoid re-visiting the
              path elements that are shared between adjacent entries.  If  the
              input  is  not  sorted, some path elements (implied directories)
              may end up being scanned multiple times, and rsync will  eventu-
              ally  unduplicate them after they get turned into file-list ele-
              ments.

       --from0, -0
              This tells rsync that the rules/filenames it reads from  a  file
              are  terminated  by  a  null  ('\0') character, not a NL, CR, or
              CR+LF.  This affects  --exclude-from,  --include-from,  --files-
              from,  and  any  merged  files specified in a --filter rule.  It
              does not affect --cvs-exclude  (since  all  names  read  from  a
              .cvsignore file are split on whitespace).

       --protect-args, -s
              This  option  sends all filenames and most options to the remote
              rsync without allowing the remote shell to interpret them.  This
              means  that  spaces are not split in names, and any non-wildcard
              special characters are not translated  (such  as  ~,  $,  ;,  &,
              etc.).   Wildcards  are  expanded  on  the  remote host by rsync
              (instead of the shell doing it).

              If you use this option with --iconv, the  args  related  to  the
              remote side will also be translated from the local to the remote
              character-set.  The translation happens  before  wild-cards  are
              expanded.  See also the --files-from option.

              You  may  also  control  this  option via the RSYNC_PROTECT_ARGS
              environment variable.  If this variable has  a  non-zero  value,
              this  option  will  be  enabled by default, otherwise it will be
              disabled by default.  Either state is overridden by  a  manually
              specified positive or negative version of this option (note that
              --no-s and --no-protect-args are the negative versions).   Since
              this  option  was first introduced in 3.0.0, you'll need to make
              sure it's disabled if you ever need to interact  with  a  remote
              rsync that is older than that.

              Rsync can also be configured (at build time) to have this option
              enabled by default (with is overridden by both  the  environment
              and  the command-line).  Run rsync --version to check if this is
              the case, as it will display "default protect-args" or "optional
              protect-args" depending on how it was compiled.

              This option will eventually become a new default setting at some
              as-yet-undetermined point in the future.

       --copy-as=USER[:GROUP]
              This option instructs rsync to use the USER  and  (if  specified
              after  a  colon)  the  GROUP for the copy operations.  This only
              works if the user that is  running  rsync  has  the  ability  to
              change  users.   If  the  group is not specified then the user's
              default groups are used.

              This option can help to reduce the risk of an rsync being run as
              root  into  or  out  of a directory that might have live changes
              happening to it and you want to make sure that  root-level  read
              or  write  actions  of system files are not possible.  While you
              could alternatively run all of  rsync  as  the  specified  user,
              sometimes  you need the root-level host-access credentials to be
              used, so this allows rsync to drop root for the copying part  of
              the  operation  after  the  remote-shell or daemon connection is
              established.

              The option only affects one side  of  the  transfer  unless  the
              transfer is local, in which case it affects both sides.  Use the
              --remote-option to affect the remote  side,  such  as  -M--copy-
              as=joe.   For a local transfer, the lsh (or lsh.sh) support file
              provides a local-shell helper script that can be used to allow a
              "localhost:"  or "lh:" host-spec to be specified without needing
              to setup any remote  shells,  allowing  you  to  specify  remote
              options  that  affect the side of the transfer that is using the
              host-spec (and using hostname "lh" avoids the overriding of  the
              remote directory to the user's home dir).

              For  example, the following rsync writes the local files as user
              "joe":

                  sudo rsync -aiv --copy-as=joe host1:backups/joe/ /home/joe/

              This makes all files owned by user "joe", limits the  groups  to
              those  that  are available to that user, and makes it impossible
              for the joe user to do a timed exploit of the path to  induce  a
              change to a file that the joe user has no permissions to change.

              The following command does a local copy into the "dest/" dir  as
              user  "joe" (assuming you've installed support/lsh into a dir on
              your $PATH):

                  sudo rsync -aive lsh -M--copy-as=joe src/ lh:dest/

       --temp-dir=DIR, -T
              This option instructs rsync to use DIR as  a  scratch  directory
              when  creating  temporary copies of the files transferred on the
              receiving side.  The default behavior is to create  each  tempo-
              rary  file  in  the same directory as the associated destination
              file.  Beginning with rsync 3.1.1, the  temp-file  names  inside
              the specified DIR will not be prefixed with an extra dot (though
              they will still have a random suffix added).

              This option is most often used when the receiving disk partition
              does  not  have  enough free space to hold a copy of the largest
              file in the transfer.  In  this  case  (i.e.  when  the  scratch
              directory  is  on a different disk partition), rsync will not be
              able to rename each received temporary file over the top of  the
              associated  destination  file,  but  instead  must  copy it into
              place.  Rsync does this by copying the file over the top of  the
              destination  file,  which  means  that the destination file will
              contain truncated data during this copy.  If this were not  done
              this  way  (even if the destination file were first removed, the
              data locally copied to  a  temporary  file  in  the  destination
              directory, and then renamed into place) it would be possible for
              the old file to continue taking up disk space (if someone had it
              open),  and  thus  there might not be enough room to fit the new
              version on the disk at the same time.

              If you are using this option for reasons other than  a  shortage
              of  disk  space,  you  may  wish to combine it with the --delay-
              updates option, which will ensure that all copied files get  put
              into  subdirectories  in the destination hierarchy, awaiting the
              end of the transfer.  If you don't have enough room to duplicate
              all the arriving files on the destination partition, another way
              to tell rsync that you aren't overly concerned about disk  space
              is to use the --partial-dir option with a relative path; because
              this tells rsync that it is OK to stash off a copy of  a  single
              file  in  a  subdir in the destination hierarchy, rsync will use
              the partial-dir as a staging area to bring over the copied file,
              and  then  rename it into place from there. (Specifying a --par-
              tial-dir with an absolute path does not have this  side-effect.)

       --fuzzy, -y
              This option tells rsync that it should look for a basis file for
              any destination file that is  missing.   The  current  algorithm
              looks in the same directory as the destination file for either a
              file that has an identical size and modified-time,  or  a  simi-
              larly-named  file.  If found, rsync uses the fuzzy basis file to
              try to speed up the transfer.

              If the option is repeated, the fuzzy scan will also be  done  in
              any  matching  alternate destination directories that are speci-
              fied via --compare-dest, --copy-dest, or --link-dest.

              Note that the use of the --delete option might get  rid  of  any
              potential  fuzzy-match  files,  so  either use --delete-after or
              specify some filename exclusions if you need to prevent this.

       --compare-dest=DIR
              This option instructs  rsync  to  use  DIR  on  the  destination
              machine  as an additional hierarchy to compare destination files
              against doing transfers (if the files are missing in the  desti-
              nation  directory).  If a file is found in DIR that is identical
              to the sender's file, the file will NOT be  transferred  to  the
              destination  directory.   This  is  useful for creating a sparse
              backup of just files that have changed from an  earlier  backup.
              This  option  is  typically used to copy into an empty (or newly
              created) directory.

              Beginning in version 2.6.4, multiple --compare-dest  directories
              may  be  provided,  which will cause rsync to search the list in
              the order specified for an exact match.  If  a  match  is  found
              that  differs  only  in attributes, a local copy is made and the
              attributes updated.  If a match is not found, a basis file  from
              one  of  the DIRs will be selected to try to speed up the trans-
              fer.

              If DIR is a relative path, it is  relative  to  the  destination
              directory.  See also --copy-dest and --link-dest.

              NOTE:  beginning  with  version  3.1.0, rsync will remove a file
              from a non-empty destination hierarchy  if  an  exact  match  is
              found  in  one  of  the compare-dest hierarchies (making the end
              result more closely match a fresh copy).

       --copy-dest=DIR
              This option behaves like --compare-dest,  but  rsync  will  also
              copy  unchanged  files found in DIR to the destination directory
              using a local copy.  This is useful for doing transfers to a new
              destination  while leaving existing files intact, and then doing
              a flash-cutover when all files  have  been  successfully  trans-
              ferred.

              Multiple  --copy-dest  directories  may  be provided, which will
              cause rsync to search the list in the  order  specified  for  an
              unchanged  file.  If a match is not found, a basis file from one
              of the DIRs will be selected to try to speed up the transfer.

              If DIR is a relative path, it is  relative  to  the  destination
              directory.  See also --compare-dest and --link-dest.

       --link-dest=DIR
              This  option  behaves  like --copy-dest, but unchanged files are
              hard linked from DIR to the destination  directory.   The  files
              must be identical in all preserved attributes (e.g. permissions,
              possibly  ownership)  in  order  for  the  files  to  be  linked
              together.  An example:

                  rsync -av --link-dest=$PWD/prior_dir host:src_dir/ new_dir/

              If  file's  aren't linking, double-check their attributes.  Also
              check if some attributes are getting forced outside  of  rsync's
              control,  such  a  mount  option  that squishes root to a single
              user, or mounts a removable drive with generic  ownership  (such
              as OS X's "Ignore ownership on this volume" option).

              Beginning in version 2.6.4, multiple --link-dest directories may
              be provided, which will cause rsync to search the  list  in  the
              order  specified for an exact match (there is a limit of 20 such
              directories).   If  a  match  is  found  that  differs  only  in
              attributes, a local copy is made and the attributes updated.  If
              a match is not found, a basis file from one of the DIRs will  be
              selected to try to speed up the transfer.

              This  option  works  best when copying into an empty destination
              hierarchy, as existing files may get their  attributes  tweaked,
              and  that can affect alternate destination files via hard-links.
              Also, itemizing of changes can get a  bit  muddled.   Note  that
              prior to version 3.1.0, an alternate-directory exact match would
              never be found (nor linked into the destination) when a destina-
              tion file already exists.

              Note  that if you combine this option with --ignore-times, rsync
              will not link any files together because it only links identical
              files  together as a substitute for transferring the file, never
              as an additional check after the file is updated.

              If DIR is a relative path, it is  relative  to  the  destination
              directory.  See also --compare-dest and --copy-dest.

              Note  that  rsync  versions  prior to 2.6.1 had a bug that could
              prevent --link-dest from working properly for  a  non-super-user
              when  -o  was specified (or implied by -a).  You can work-around
              this bug by avoiding the -o option when sending to an old rsync.

       --compress, -z
              With  this  option, rsync compresses the file data as it is sent
              to the destination machine, which reduces  the  amount  of  data
              being  transmitted --  something that is useful over a slow con-
              nection.

              Rsync supports multiple compression methods and will choose  one
              for  you unless you force the choice using the --compress-choice
              (--zc) option.

              Run rsync --version to see the default  compress  list  compiled
              into your version.

              When  both  sides  of  the  transfer  are  at least 3.2.0, rsync
              chooses the first algorithm in the client's list of choices that
              is  also in the server's list of choices.  If no common compress
              choice is found, rsync exits with an error.  If the remote rsync
              is  too old to support checksum negotiation, its list is assumed
              to be "zlib".

              The default order can be customized by setting  the  environment
              variable   RSYNC_COMPRESS_LIST  to  a  space-separated  list  of
              acceptable compression names.  If  the  string  contains  a  "&"
              character,  it  is  separated  into  the "client string & server
              string", otherwise the same string  applies  to  both.   If  the
              string  (or  string  portion) contains no non-whitespace charac-
              ters, the default compress list is used.  Any  unknown  compres-
              sion  names  are  discarded  from the list, but a list with only
              invalid names results in a failed negotiation.

              There are some older rsync  versions  that  were  configured  to
              reject a -z option and require the use of -zz because their com-
              pression library was not compatible with the default  zlib  com-
              pression  method.   You can usually ignore this weirdness unless
              the rsync server complains and tells you to specify -zz.

              See also the --skip-compress option for the default list of file
              suffixes  that will be transferred with no (or minimal) compres-
              sion.

       --compress-choice=STR, --zc=STR
              This option can be used to override the automatic negotiation of
              the  compression  algorithm that occurs when --compress is used.
              The option implies --compress unless "none" was specified, which
              instead implies --no-compress.

              The compression options that you may be able to use are:


              o      zstd

              o      lz4

              o      zlibx

              o      zlib

              o      none

              Run  rsync --version  to  see the default compress list compiled
              into your version (which may differ from the list above).

              Note that if you see an error about an option  named  --old-com-
              press or --new-compress, this is rsync trying to send the --com-
              press-choice=zlib or --compress-choice=zlibx option in  a  back-
              ward-compatible  manner  that  more  rsync  versions understand.
              This error indicates that the older rsync version on the  server
              will not allow you to force the compression type.

              Note  that  the "zlibx" compression algorithm is just the "zlib"
              algorithm with matched data excluded from the compression stream
              (to  try to make it more compatible with an external zlib imple-
              mentation).

       --compress-level=NUM, --zl=NUM
              Explicitly set the compression level to use (see --compress, -z)
              instead of letting it default.  The --compress option is implied
              as long as the level chosen is not a "don't compress" level  for
              the  compression algorithm that is in effect (e.g. zlib compres-
              sion treats level 0 as "off").

              The level values vary  depending  on  the  checksum  in  effect.
              Because  rsync will negotiate a checksum choice by default (when
              the remote rsync is new enough), it can be good to combine  this
              option with a --compress-choice (--zc) option unless you're sure
              of the choice in effect.  For example:

                  rsync -aiv --zc=zstd --zl=22 host:src/ dest/

              For zlib & zlibx compression the valid values are from  1  to  9
              with  6  being the default.  Specifying 0 turns compression off,
              and specifying -1 chooses the default of 6.

              For zstd compression the valid values are  from  -131072  to  22
              with 3 being the default. Specifying 0 chooses the default of 3.

              For lz4 compression there are no levels, so the value is  always
              0.

              If  you  specify  a  too-large or too-small value, the number is
              silently limited to a valid value.  This allows you  to  specify
              something  like --zl=999999999 and be assured that you'll end up
              with the maximum compression level no matter what algorithm  was
              chosen.

              If  you  want  to  know the compression level that is in effect,
              specify --debug=nstr to see  the  "negotiated  string"  results.
              This     will     report     something     like     "Client com-
              press: zstd (level 3)"  (along  with  the  checksum  choice   in
              effect).

       --skip-compress=LIST
              Override  the  list  of file suffixes that will be compressed as
              little as possible.  Rsync sets the compression level on a  per-
              file basis based on the file's suffix.  If the compression algo-
              rithm has an "off" level (such as zlib/zlibx) then  no  compres-
              sion  occurs  for  those  files.   Other algorithms that support
              changing the streaming level on-the-fly will have the level min-
              imized to reduces the CPU usage as much as possible for a match-
              ing file.  At this time, only zlib & zlibx  compression  support
              this changing of levels on a per-file basis.

              The  LIST  should be one or more file suffixes (without the dot)
              separated by slashes (/).  You may specify an  empty  string  to
              indicate that no files should be skipped.

              Simple  character-class matching is supported: each must consist
              of a list of letters inside the square brackets (e.g. no special
              classes, such as "[:alpha:]", are supported, and '-' has no spe-
              cial meaning).

              The characters asterisk (*) and question-mark (?) have  no  spe-
              cial meaning.

              Here's  an example that specifies 6 suffixes to skip (since 1 of
              the 5 rules matches 2 suffixes):

                  --skip-compress=gz/jpg/mp[34]/7z/bz2

              The default file suffixes in the skip-compress list in this ver-
              sion of rsync are:

                  3g2  3gp 7z aac ace apk avi bz2 deb dmg ear f4v flac flv gpg
                  gz iso jar jpeg jpg lrz lz lz4 lzma lzo m1a m1v m2a m2ts m2v
                  m4a m4b m4p m4r m4v mka mkv mov mp1 mp2 mp3 mp4 mpa mpeg mpg
                  mpv mts odb odf odg odi odm odp ods odt oga ogg ogm ogv  ogx
                  opus  otg  oth  otp  ots  ott oxt png qt rar rpm rz rzip spx
                  squashfs sxc sxd sxg sxm sxw sz tbz tbz2 tgz tlz ts txz  tzo
                  vob war webm webp xz z zip zst

              This  list  will be replaced by your --skip-compress list in all
              but one situation: a copy from a  daemon  rsync  will  add  your
              skipped  suffixes  to its list of non-compressing files (and its
              list may be configured to a different default).

       --numeric-ids
              With this option rsync will transfer numeric group and user  IDs
              rather  than using user and group names and mapping them at both
              ends.

              By default rsync will use the username and groupname  to  deter-
              mine  what  ownership  to give files.  The special uid 0 and the
              special group 0 are never mapped via user/group  names  even  if
              the --numeric-ids option is not specified.

              If a user or group has no name on the source system or it has no
              match on the destination system, then the numeric  ID  from  the
              source  system  is  used  instead.  See also the comments on the
              "use chroot" setting in the rsyncd.conf manpage for  information
              on how the chroot setting affects rsync's ability to look up the
              names of the users and groups and what you can do about it.

       --usermap=STRING, --groupmap=STRING
              These options allow you to specify users and groups that  should
              be  mapped to other values by the receiving side.  The STRING is
              one or more FROM:TO pairs of values separated  by  commas.   Any
              matching  FROM value from the sender is replaced with a TO value
              from the receiver.  You may specify usernames or  user  IDs  for
              the  FROM  and TO values, and the FROM value may also be a wild-
              card string, which will be matched against  the  sender's  names
              (wild-cards  do  NOT  match against ID numbers, though see below
              for why a '*' matches everything).  You may  instead  specify  a
              range of ID numbers via an inclusive range: LOW-HIGH.  For exam-
              ple:

                  --usermap=0-99:nobody,wayne:admin,*:normal --groupmap=usr:1,1:usr

              The first match in the list is the one that is used.  You should
              specify  all your user mappings using a single --usermap option,
              and/or all your group mappings using a single --groupmap option.

              Note  that  the  sender's  name for the 0 user and group are not
              transmitted to the receiver, so you should  either  match  these
              values  using  a  0, or use the names in effect on the receiving
              side (typically "root").  All other FROM names  match  those  in
              use on the sending side.  All TO names match those in use on the
              receiving side.

              Any IDs that do not have a name on the sending side are  treated
              as  having  an  empty  name  for  the purpose of matching.  This
              allows them to be matched via a "*" or using an empty name.  For
              instance:

                  --usermap=:nobody --groupmap=*:nobody

              When  the --numeric-ids option is used, the sender does not send
              any names, so all the IDs are treated as having an  empty  name.
              This  means that you will need to specify numeric FROM values if
              you want to map these nameless IDs to different values.

              For the --usermap option to have any effect,  the  -o  (--owner)
              option  must be used (or implied), and the receiver will need to
              be running as a super-user (see also the  --fake-super  option).
              For  the --groupmap option to have any effect, the -g (--groups)
              option must be used (or implied), and the receiver will need  to
              have permissions to set that group.

              If  your shell complains about the wildcards, use --protect-args
              (-s).

       --chown=USER:GROUP
              This option forces all files to be  owned  by  USER  with  group
              GROUP.   This  is  a  simpler interface than using --usermap and
              --groupmap directly, but it is implemented using  those  options
              internally, so you cannot mix them.  If either the USER or GROUP
              is empty, no mapping for the omitted user/group will occur.   If
              GROUP  is  empty, the trailing colon may be omitted, but if USER
              is empty, a leading colon must be supplied.

              If you specify "--chown=foo:bar", this is exactly  the  same  as
              specifying  "--usermap=*:foo --groupmap=*:bar", only easier.  If
              your shell complains about  the  wildcards,  use  --protect-args
              (-s).

       --timeout=SECONDS
              This  option allows you to set a maximum I/O timeout in seconds.
              If no data is transferred for the specified time then rsync will
              exit.  The default is 0, which means no timeout.

       --contimeout=SECONDS
              This option allows you to set the amount of time that rsync will
              wait for its connection to an rsync daemon to succeed.   If  the
              timeout is reached, rsync exits with an error.

       --address=ADDRESS
              By default rsync will bind to the wildcard address when connect-
              ing to an rsync daemon.  The  --address  option  allows  you  to
              specify  a  specific  IP  address (or hostname) to bind to.  See
              also this option in the --daemon mode section.

       --port=PORT
              This specifies an alternate TCP port number to use  rather  than
              the  default  of  873.  This is only needed if you are using the
              double-colon (::) syntax to connect with an rsync daemon  (since
              the  URL  syntax  has a way to specify the port as a part of the
              URL).  See also this option in the --daemon mode section.

       --sockopts=OPTIONS
              This option can provide endless fun for people who like to  tune
              their  systems  to  the utmost degree.  You can set all sorts of
              socket options which may make  transfers  faster  (or  slower!).
              Read  the  man page for the setsockopt() system call for details
              on some of the options you may be able to set.   By  default  no
              special socket options are set.  This only affects direct socket
              connections to a remote rsync daemon.

              This option also exists in the --daemon mode section.

       --blocking-io
              This tells rsync to use blocking I/O  when  launching  a  remote
              shell  transport.   If  the remote shell is either rsh or remsh,
              rsync defaults to using blocking I/O, otherwise it  defaults  to
              using  non-blocking  I/O.  (Note  that  ssh prefers non-blocking
              I/O.)

       --outbuf=MODE
              This sets the output buffering mode.  The mode can be None  (aka
              Unbuffered), Line, or Block (aka Full).  You may specify as lit-
              tle as a single letter for the mode,  and  use  upper  or  lower
              case.

              The  main use of this option is to change Full buffering to Line
              buffering when rsync's output is going to a file or pipe.

       --itemize-changes, -i
              Requests a simple itemized list of the changes  that  are  being
              made to each file, including attribute changes.  This is exactly
              the same as specifying --out-format='%i %n%L'.   If  you  repeat
              the option, unchanged files will also be output, but only if the
              receiving rsync is at least version 2.6.7 (you can use -vv  with
              older  versions  of  rsync, but that also turns on the output of
              other verbose messages).

              The "%i" escape has a cryptic output that is  11  letters  long.
              The  general  format is like the string YXcstpoguaxf, where Y is
              replaced by the type of update being done, X is replaced by  the
              file-type,  and  the other letters represent attributes that may
              be output if they are being modified.

              The update types that replace the Y are as follows:


              o      A < means that a file is being transferred to the  remote
                     host (sent).

              o      A  >  means that a file is being transferred to the local
                     host (received).

              o      A c means that a local change/creation is  occurring  for
                     the  item  (such  as  the  creation of a directory or the
                     changing of a symlink, etc.).

              o      A h means that the item is a hard link  to  another  item
                     (requires --hard-links).

              o      A  .  means that the item is not being updated (though it
                     might have attributes that are being modified).

              o      A * means that the rest of the itemized-output area  con-
                     tains a message (e.g. "deleting").

              The  file-types  that replace the X are: f for a file, a d for a
              directory, an L for a symlink, a D for a device, and a S  for  a
              special file (e.g. named sockets and fifos).

              The  other  letters in the string indicate if some attributes of
              the file have changed, as follows:


              o      "." - the attribute is unchanged.

              o      "+" - the file is newly created.

              o      " " - all the attributes are unchanged (all dots turn  to
                     spaces).

              o      "?"  -  the  change  is unknown (when the remote rsync is
                     old).

              o      A letter indicates an attribute is being updated.

              The attribute that is associated with each letter is as follows:


              o      A  c  means  either  that  a regular file has a different
                     checksum (requires --checksum) or that a symlink, device,
                     or  special  file  has a changed value.  Note that if you
                     are sending files to an rsync prior to 3.0.1, this change
                     flag  will be present only for checksum-differing regular
                     files.

              o      A s means the size of a regular  file  is  different  and
                     will be updated by the file transfer.

              o      A t means the modification time is different and is being
                     updated to the sender's  value  (requires  --times).   An
                     alternate  value  of  T  means that the modification time
                     will be set to the transfer time, which  happens  when  a
                     file/symlink/device is updated without --times and when a
                     symlink is changed and the receiver can't set  its  time.
                     (Note:  when  using  an rsync 3.0.0 client, you might see
                     the s flag combined with t instead of the proper  T  flag
                     for this time-setting failure.)

              o      A  p  means  the  permissions are different and are being
                     updated to the sender's value (requires --perms).

              o      An o means the owner is different and is being updated to
                     the sender's value (requires --owner and super-user priv-
                     ileges).

              o      A g means the group is different and is being updated  to
                     the sender's value (requires --group and the authority to
                     set the group).

              o      A u|n|b indicates the following information: u  means the
                     access  (use)  time  is different and is being updated to
                     the sender's value (requires --atimes); n means the  cre-
                     ate  time  (newness) is different and is being updated to
                     the sender's value (requires  --crtimes);  b  means  that
                     both the access and create times are being updated.

              o      The a means that the ACL information is being changed.

              o      The  x  means  that the extended attribute information is
                     being changed.

              One other output is possible: when deleting files, the "%i" will
              output  the  string  "*deleting"  for  each  item  that is being
              removed (assuming that you are talking to a recent enough  rsync
              that  it  logs deletions instead of outputting them as a verbose
              message).

       --out-format=FORMAT
              This allows you to specify exactly what the rsync client outputs
              to  the user on a per-update basis.  The format is a text string
              containing embedded single-character escape  sequences  prefixed
              with  a  percent  (%)  character.  A default format of "%n%L" is
              assumed if either --info=name or -v is specified (this tells you
              just  the  name of the file and, if the item is a link, where it
              points).  For a full list of the possible escape characters, see
              the "log format" setting in the rsyncd.conf manpage.

              Specifying  the  --out-format  option  implies  the  --info=name
              option, which will  mention  each  file,  dir,  etc.  that  gets
              updated  in  a  significant way (a transferred file, a recreated
              symlink/device, or a touched directory).  In  addition,  if  the
              itemize-changes  escape  (%i) is included in the string (e.g. if
              the --itemize-changes option was used),  the  logging  of  names
              increases  to  mention  any  item that is changed in any way (as
              long as the receiving side is at least 2.6.4).  See the  --item-
              ize-changes option for a description of the output of "%i".

              Rsync will output the out-format string prior to a file's trans-
              fer unless one of the transfer-statistic escapes  is  requested,
              in  which  case  the  logging  is  done at the end of the file's
              transfer.  When this late logging is in effect and --progress is
              also  specified,  rsync  will  also  output the name of the file
              being transferred prior to its progress  information  (followed,
              of course, by the out-format output).

       --log-file=FILE
              This  option  causes  rsync  to  log what it is doing to a file.
              This is similar to the logging that a daemon does,  but  can  be
              requested  for  the client side and/or the server side of a non-
              daemon transfer.  If specified as a client option, transfer log-
              ging  will  be  enabled with a default format of "%i %n%L".  See
              the --log-file-format option if you wish to override this.

              Here's a example command that requests the remote  side  to  log
              what is happening:

                  rsync -av --remote-option=--log-file=/tmp/rlog src/ dest/

              This  is  very  useful  if you need to debug why a connection is
              closing unexpectedly.

       --log-file-format=FORMAT
              This allows you to specify exactly what  per-update  logging  is
              put into the file specified by the --log-file option (which must
              also be specified for this option to have any effect).   If  you
              specify  an empty string, updated files will not be mentioned in
              the log file.  For a list of the possible escape characters, see
              the "log format" setting in the rsyncd.conf manpage.

              The  default  FORMAT  used  if  --log-file is specified and this
              option is not is '%i %n%L'.

       --stats
              This tells rsync to print a verbose set  of  statistics  on  the
              file transfer, allowing you to tell how effective rsync's delta-
              transfer algorithm is for your data.  This option is  equivalent
              to  --info=stats2  if  combined  with  0  or  1  -v  options, or
              --info=stats3 if combined with 2 or more -v options.

              The current statistics are as follows:


              o      Number of files is the  count  of  all  "files"  (in  the
                     generic  sense),  which  includes  directories, symlinks,
                     etc.  The total count will  be  followed  by  a  list  of
                     counts by filetype (if the total is non-zero).  For exam-
                     ple: "(reg: 5, dir: 3, link:  2,  dev:  1,  special:  1)"
                     lists  the  totals  for  regular files, directories, sym-
                     links, devices, and special files.  If any of value is 0,
                     it is completely omitted from the list.

              o      Number of created files  is the count of how many "files"
                     (generic sense) were created  (as  opposed  to  updated).
                     The  total  count will be followed by a list of counts by
                     filetype (if the total is non-zero).

              o      Number of deleted files is the count of how many  "files"
                     (generic  sense)  were  created  (as opposed to updated).
                     The total count will be followed by a list of  counts  by
                     filetype (if the total is non-zero).  Note that this line
                     is only output if deletions are in effect,  and  only  if
                     protocol  31 is being used (the default for rsync 3.1.x).

              o      Number of regular files transferred is the count of  nor-
                     mal  files  that  were updated via rsync's delta-transfer
                     algorithm, which does not include  dirs,  symlinks,  etc.
                     Note  that rsync 3.1.0 added the word "regular" into this
                     heading.

              o      Total file size is the total sum of all file sizes in the
                     transfer.   This  does not count any size for directories
                     or special files, but does include the size of  symlinks.

              o      Total transferred file size is the total sum of all files
                     sizes for just the transferred files.

              o      Literal data is how much unmatched  file-update  data  we
                     had  to  send  to  the  receiver  for  it to recreate the
                     updated files.

              o      Matched data is how much data the  receiver  got  locally
                     when recreating the updated files.

              o      File list size is how big the file-list data was when the
                     sender sent it to the receiver.  This is smaller than the
                     in-memory  size for the file list due to some compressing
                     of duplicated data when rsync sends the list.

              o      File list generation time is the number of  seconds  that
                     the sender spent creating the file list.  This requires a
                     modern rsync on the sending side for this to be  present.

              o      File list transfer time is the number of seconds that the
                     sender spent sending the file list to the receiver.

              o      Total bytes sent is the count of all the bytes that rsync
                     sent from the client side to the server side.

              o      Total bytes received  is  the  count  of  all non-message
                     bytes that rsync received by the  client  side  from  the
                     server  side.  "Non-message"  bytes  means  that we don't
                     count the bytes for a verbose  message  that  the  server
                     sent to us, which makes the stats more consistent.

       --8-bit-output, -8
              This  tells  rsync to leave all high-bit characters unescaped in
              the output instead of trying to test  them  to  see  if  they're
              valid  in the current locale and escaping the invalid ones.  All
              control characters (but never tabs) are always escaped,  regard-
              less of this option's setting.

              The  escape  idiom  that started in 2.6.7 is to output a literal
              backslash (\) and a hash (#), followed by exactly 3  octal  dig-
              its.  For example, a newline would output as "\#012".  A literal
              backslash that is in a filename is not escaped unless it is fol-
              lowed by a hash and 3 digits (0-9).

       --human-readable, -h
              Output  numbers  in  a  more human-readable format.  There are 3
              possible levels: (1) output numbers  with  a  separator  between
              each  set  of 3 digits (either a comma or a period, depending on
              if the decimal point is represented by a period or a comma); (2)
              output  numbers  in  units  of 1000 (with a character suffix for
              larger units -- see below); (3) output numbers in units of 1024.

              The default is human-readable level 1.  Each -h option increases
              the level by one.  You can take the level down to 0  (to  output
              numbers  as  pure  digits) by specifying the --no-human-readable
              (--no-h) option.

              The unit letters that are appended in levels  2  and  3  are:  K
              (kilo), M (mega), G (giga), T (tera), or P (peta).  For example,
              a 1234567-byte file would output as 1.23M in  level-2  (assuming
              that a period is your local decimal point).

              Backward compatibility note: versions of rsync prior to 3.1.0 do
              not support human-readable level 1, and they default to level 0.
              Thus, specifying one or two -h options will behave in a compara-
              ble manner in old and new versions as long as you didn't specify
              a  --no-h  option  prior  to  one  or  more -h options.  See the
              --list-only option for one difference.

       --partial
              By default, rsync will delete any partially transferred file  if
              the  transfer  is interrupted.  In some circumstances it is more
              desirable to keep partially transferred files.  Using the --par-
              tial  option  tells  rsync to keep the partial file which should
              make a subsequent transfer of the rest of the file much  faster.

       --partial-dir=DIR
              A  better way to keep partial files than the --partial option is
              to specify a DIR that will be used  to  hold  the  partial  data
              (instead  of  writing  it  out to the destination file).  On the
              next transfer, rsync will use a file found in this dir  as  data
              to  speed  up  the resumption of the transfer and then delete it
              after it has served its purpose.

              Note that if --whole-file is specified (or  implied),  any  par-
              tial-dir  file  that  is  found for a file that is being updated
              will simply be removed (since rsync  is  sending  files  without
              using rsync's delta-transfer algorithm).

              Rsync will create the DIR if it is missing (just the last dir --
              not the whole path).  This makes it easy to use a relative  path
              (such  as  "--partial-dir=.rsync-partial")  to have rsync create
              the partial-directory in the destination file's  directory  when
              needed,  and  then  remove  it  again  when  the partial file is
              deleted.  Note that the directory is only removed  if  it  is  a
              relative pathname, as it is expected that an absolute path is to
              a directory that is reserved for partial-dir work.

              If the partial-dir value is not an absolute path, rsync will add
              an  exclude rule at the end of all your existing excludes.  This
              will prevent the sending of any partial-dir files that may exist
              on the sending side, and will also prevent the untimely deletion
              of partial-dir items on the receiving  side.   An  example:  the
              above   --partial-dir   option   would  add  the  equivalent  of
              "-f '-p .rsync-partial/'" at the end of any other filter  rules.

              If you are supplying your own exclude rules, you may need to add
              your own exclude/hide/protect rule for the  partial-dir  because
              (1)  the  auto-added  rule may be ineffective at the end of your
              other rules, or (2) you may wish  to  override  rsync's  exclude
              choice.   For  instance,  if you want to make rsync clean-up any
              left-over partial-dirs that may  be  lying  around,  you  should
              specify  --delete-after  and  add  a  "risk"  filter  rule, e.g.
              -f 'R .rsync-partial/'.   (Avoid   using   --delete-before    or
              --delete-during  unless  you  don't need rsync to use any of the
              left-over partial-dir data during the current run.)

              IMPORTANT: the --partial-dir should not  be  writable  by  other
              users or it is a security risk.  E.g. AVOID "/tmp".

              You  can  also  set  the partial-dir value the RSYNC_PARTIAL_DIR
              environment variable.  Setting this in the environment does  not
              force  --partial to be enabled, but rather it affects where par-
              tial files  go  when  --partial  is  specified.   For  instance,
              instead of using --partial-dir=.rsync-tmp along with --progress,
              you could set RSYNC_PARTIAL_DIR=.rsync-tmp in  your  environment
              and  then  just  use  the  -P  option  to turn on the use of the
              .rsync-tmp dir for partial transfers.  The only times  that  the
              --partial  option  does  not look for this environment value are
              (1) when --inplace was specified (since --inplace conflicts with
              --partial-dir),  and (2) when --delay-updates was specified (see
              below).

              When a modern rsync resumes the transfer of a file in  the  par-
              tial-dir,  that  partial file is now updated in-place instead of
              creating yet another tmp-file copy (so it maxes out  at  dest  +
              tmp  instead  of dest + partial + tmp).  This requires both ends
              of the transfer to be at least version 3.2.0.

              For the purposes of the  daemon-config's  "refuse options"  set-
              ting, --partial-dir does not imply --partial.  This is so that a
              refusal of the --partial option can  be  used  to  disallow  the
              overwriting  of destination files with a partial transfer, while
              still allowing the safer idiom provided by --partial-dir.

       --delay-updates
              This option puts the temporary file from each updated file  into
              a holding directory until the end of the transfer, at which time
              all the files are renamed into place in rapid succession.   This
              attempts to make the updating of the files a little more atomic.
              By default the files are placed into a directory named .~tmp~ in
              each  file's  destination directory, but if you've specified the
              --partial-dir option, that directory will be used instead.   See
              the  comments  in  the --partial-dir section for a discussion of
              how this .~tmp~ dir will be excluded from the transfer, and what
              you  can  do  if  you want rsync to cleanup old .~tmp~ dirs that
              might be lying around.  Conflicts with --inplace and --append.

              This option implies --no-inc-recursive since it needs  the  full
              file  list  in  memory in order to be able to iterate over it at
              the end.

              This option uses more memory on the receiving side (one bit  per
              file  transferred)  and  also requires enough free disk space on
              the receiving side to hold an additional copy of all the updated
              files.   Note  also  that you should not use an absolute path to
              --partial-dir unless (1) there is no chance of any of the  files
              in  the  transfer  having  the  same name (since all the updated
              files will be put into a single directory if the path  is  abso-
              lute)  and (2) there are no mount points in the hierarchy (since
              the delayed updates will fail if  they  can't  be  renamed  into
              place).

              See  also the "atomic-rsync" perl script in the "support" subdir
              for an update algorithm  that  is  even  more  atomic  (it  uses
              --link-dest and a parallel hierarchy of files).

       --prune-empty-dirs, -m
              This option tells the receiving rsync to get rid of empty direc-
              tories from the file-list,  including  nested  directories  that
              have no non-directory children.  This is useful for avoiding the
              creation of a bunch of  useless  directories  when  the  sending
              rsync  is  recursively  scanning  a  hierarchy  of  files  using
              include/exclude/filter rules.

              Note that the use of transfer  rules,  such  as  the  --min-size
              option,  does  not affect what goes into the file list, and thus
              does not leave directories empty, even if none of the files in a
              directory match the transfer rule.

              Because the file-list is actually being pruned, this option also
              affects what directories get deleted when a  delete  is  active.
              However,  keep  in  mind that excluded files and directories can
              prevent existing items from being deleted due to an exclude both
              hiding  source  files and protecting destination files.  See the
              perishable filter-rule option for how to avoid this.

              You can prevent the pruning of certain  empty  directories  from
              the file-list by using a global "protect" filter.  For instance,
              this option would ensure that the directory "emptydir" was  kept
              in the file-list:

                  --filter 'protect emptydir/'

              Here's  an  example  that  copies all .pdf files in a hierarchy,
              only creating the necessary destination directories to hold  the
              .pdf  files, and ensures that any superfluous files and directo-
              ries in the destination are removed (note  the  hide  filter  of
              non-directories being used instead of an exclude):

                  rsync -avm --del --include='*.pdf' -f 'hide,! */' src/ dest

              If  you didn't want to remove superfluous destination files, the
              more time-honored options of --include='*/' --exclude='*'  would
              work  fine  in place of the hide-filter (if that is more natural
              to you).

       --progress
              This  option  tells  rsync  to  print  information  showing  the
              progress  of the transfer.  This gives a bored user something to
              watch.  With a modern rsync  this  is  the  same  as  specifying
              --info=flist2,name,progress,  but any user-supplied settings for
              those      info      flags      takes      precedence      (e.g.
              "--info=flist0 --progress").

              While  rsync  is  transferring  a  regular  file,  it  updates a
              progress line that looks like this:

                  782448  63%  110.64kB/s    0:00:04

              In this example, the receiver has reconstructed 782448 bytes  or
              63% of the sender's file, which is being reconstructed at a rate
              of 110.64 kilobytes per second, and the transfer will finish  in
              4 seconds if the current rate is maintained until the end.

              These  statistics  can  be  misleading if rsync's delta-transfer
              algorithm is in use.  For example, if the sender's file consists
              of the basis file followed by additional data, the reported rate
              will probably drop dramatically when the receiver  gets  to  the
              literal data, and the transfer will probably take much longer to
              finish than the receiver  estimated  as  it  was  finishing  the
              matched part of the file.

              When  the  file  transfer  finishes, rsync replaces the progress
              line with a summary line that looks like this:

                  1,238,099 100%  146.38kB/s    0:00:08  (xfr#5, to-chk=169/396)

              In this example, the file was 1,238,099 bytes long in total, the
              average rate of transfer for the whole file was 146.38 kilobytes
              per second over the 8 seconds that it took to complete,  it  was
              the 5th transfer of a regular file during the current rsync ses-
              sion, and there are 169 more files for the receiver to check (to
              see  if  they  are  up-to-date  or not) remaining out of the 396
              total files in the file-list.

              In an incremental recursion scan, rsync  won't  know  the  total
              number  of  files  in the file-list until it reaches the ends of
              the scan, but since it starts to transfer files during the scan,
              it  will  display a line with the text "ir-chk" (for incremental
              recursion check) instead of "to-chk" until  the  point  that  it
              knows  the  full size of the list, at which point it will switch
              to using "to-chk".  Thus, seeing "ir-chk" lets you know that the
              total count of files in the file list is still going to increase
              (and each time it does, the count of files left  to  check  will
              increase by the number of the files added to the list).

       -P     The  -P  option is equivalent to --partial --progress.  Its pur-
              pose is to make it much easier to specify these two options  for
              a long transfer that may be interrupted.

              There  is also a --info=progress2 option that outputs statistics
              based on the whole transfer, rather than individual files.   Use
              this  flag without outputting a filename (e.g. avoid -v or spec-
              ify --info=name0) if you want to see how the transfer  is  doing
              without  scrolling  the  screen  with a lot of names. (You don't
              need  to  specify  the  --progress  option  in  order   to   use
              --info=progress2.)

              Finally, you can get an instant progress report by sending rsync
              a signal of either SIGINFO or SIGVTALRM.  On BSD systems, a SIG-
              INFO  is  generated  by typing a Ctrl+T (Linux doesn't currently
              support  a  SIGINFO  signal).   When  the  client-side   process
              receives one of those signals, it sets a flag to output a single
              progress report which is output when the current  file  transfer
              finishes  (so  it  may take a little time if a big file is being
              handled when the signal arrives).   A  filename  is  output  (if
              needed)  followed  by  the  --info=progress2  format of progress
              info.  If you don't know which of the 3 rsync processes  is  the
              client  process,  it's  OK to signal all of them (since the non-
              client processes ignore the signal).

              CAUTION: sending SIGVTALRM to an older  rsync  (pre-3.2.0)  will
              kill it.

       --password-file=FILE
              This  option  allows  you to provide a password for accessing an
              rsync daemon via a file or via standard input if FILE is -.  The
              file  should  contain  just  the password on the first line (all
              other lines are ignored).  Rsync will exit with an error if FILE
              is  world  readable  or if a root-run rsync command finds a non-
              root-owned file.

              This option does not supply a password to a remote shell  trans-
              port  such  as  ssh; to learn how to do that, consult the remote
              shell's documentation.  When accessing an rsync daemon  using  a
              remote  shell  as  the  transport,  this  option only comes into
              effect after the remote shell finishes its authentication  (i.e.
              if  you  have  also  specified a password in the daemon's config
              file).

       --early-input=FILE
              This option allows rsync to send up to 5K of data to the  "early
              exec"  script on its stdin.  One possible use of this data is to
              give the script a secret that can be used to mount an  encrypted
              filesystem (which you should unmount in the the "post-xfer exec"
              script).

              The daemon must be at least version 3.2.1.

       --list-only
              This option will cause the source files to be listed instead  of
              transferred.   This  option  is  inferred  if  there is a single
              source arg and no destination specified, so its main  uses  are:
              (1)  to turn a copy command that includes a destination arg into
              a file-listing command, or (2) to be able to specify  more  than
              one source arg (note: be sure to include the destination).  Cau-
              tion: keep in mind  that  a  source  arg  with  a  wild-card  is
              expanded by the shell into multiple args, so it is never safe to
              try to list such an arg without using this option. For example:

                  rsync -av --list-only foo* dest/

              Starting with rsync 3.1.0, the sizes output by  --list-only  are
              affected  by  the --human-readable option.  By default they will
              contain digit separators, but higher levels of readability  will
              output  the sizes with unit suffixes.  Note also that the column
              width for the size output has increased from 11 to 14 characters
              for all human-readable levels.  Use --no-h if you want just dig-
              its in the sizes, and the old column width of 11 characters.

              Compatibility note: when requesting a remote  listing  of  files
              from  an rsync that is version 2.6.3 or older, you may encounter
              an error if you  ask  for  a  non-recursive  listing.   This  is
              because  a  file  listing implies the --dirs option w/o --recur-
              sive, and older rsyncs don't have that option.   To  avoid  this
              problem,  either specify the --no-dirs option (if you don't need
              to expand a directory's  content),  or  turn  on  recursion  and
              exclude the content of subdirectories: -r --exclude='/*/*'.

       --bwlimit=RATE
              This  option allows you to specify the maximum transfer rate for
              the data sent over the socket, specified in  units  per  second.
              The  RATE value can be suffixed with a string to indicate a size
              multiplier,   and   may   be   a    fractional    value    (e.g.
              "--bwlimit=1.5m").  If no suffix is specified, the value will be
              assumed to be in units of 1024 bytes (as if  "K"  or  "KiB"  had
              been  appended).  See the --max-size option for a description of
              all the available suffixes.  A value of 0 specifies no limit.

              For backward-compatibility  reasons,  the  rate  limit  will  be
              rounded  to  the  nearest KiB unit, so no rate smaller than 1024
              bytes per second is possible.

              Rsync writes data over the socket in  blocks,  and  this  option
              both  limits the size of the blocks that rsync writes, and tries
              to keep the average transfer rate at the requested limit.   Some
              burstiness  may  be  seen where rsync writes out a block of data
              and then sleeps to bring the average rate into compliance.

              Due to the internal buffering of data, the --progress option may
              not  be  an  accurate  reflection  on how fast the data is being
              sent.  This is because some files can show up as  being  rapidly
              sent  when the data is quickly buffered, while other can show up
              as very slow when the flushing  of  the  output  buffer  occurs.
              This may be fixed in a future version.

       `--stop-after=MINS
              This  option tells rsync to stop copying when the specified num-
              ber of minutes has elapsed.

              Rsync also accepts an earlier version of  this  option:  --time-
              limit=MINS.

              For  maximal flexibility, rsync does not communicate this option
              to the remote rsync since it is usually enough that one side  of
              the connection quits as specified.  This allows the option's use
              even when only one side of the connection supports it.  You  can
              tell  the remote side about the time limit using --remote-option
              (-M), should the need arise.

       `--stop-at=y-m-dTh:m
              This option tells rsync to stop copying when the specified point
              in time has been reached. The date & time can be fully specified
              in  a  numeric  format   of   year-month-dayThour:minute   (e.g.
              2000-12-31T23:59) in the local timezone.  You may choose to sep-
              arate the date numbers using slashes instead of dashes.

              The value can also be abbreviated in a variety of ways, such  as
              specifying a 2-digit year and/or leaving off various values.  In
              all cases, the value will be taken to be the next possible point
              in  time  where  the supplied information matches.  If the value
              specifies the current time or a past time, rsync exits  with  an
              error.

              For example, "1-30" specifies the next January 30th (at midnight
              local time), "14:00" specifies the next 2  P.M.,  "1"  specifies
              the  next  1st of the month at midnight, "31" specifies the next
              month where we can stop on its 31st day, and ":59" specifies the
              next 59th minute after the hour.

              For  maximal flexibility, rsync does not communicate this option
              to the remote rsync since it is usually enough that one side  of
              the connection quits as specified.  This allows the option's use
              even when only one side of the connection supports it.  You  can
              tell  the remote side about the time limit using --remote-option
              (-M), should the need arise.  Do keep in mind  that  the  remote
              host may have a different default timezone than your local host.

       --write-batch=FILE
              Record a file that can later be  applied  to  another  identical
              destination with --read-batch.  See the "BATCH MODE" section for
              details, and also the --only-write-batch option.

              This option overrides the negotiated checksum &  compress  lists
              and  always negotiates a choice based on old-school md5/md4/zlib
              choices.  If you want a more modern choice, use the  --checksum-
              choice (--cc) and/or --compress-choice (--zc) options.

       --only-write-batch=FILE
              Works like --write-batch, except that no updates are made on the
              destination system when  creating  the  batch.   This  lets  you
              transport  the  changes to the destination system via some other
              means and then apply the changes via --read-batch.

              Note that you can feel free to write the batch directly to  some
              portable  media:  if this media fills to capacity before the end
              of the transfer, you can just apply that partial transfer to the
              destination  and repeat the whole process to get the rest of the
              changes (as long as you don't mind a partially updated  destina-
              tion system while the multi-update cycle is happening).

              Also note that you only save bandwidth when pushing changes to a
              remote system  because  this  allows  the  batched  data  to  be
              diverted  from  the sender into the batch file without having to
              flow over the wire to the receiver (when pulling, the sender  is
              remote, and thus can't write the batch).

       --read-batch=FILE
              Apply  all of the changes stored in FILE, a file previously gen-
              erated by --write-batch.  If FILE is -, the batch data  will  be
              read  from  standard  input.  See  the  "BATCH MODE" section for
              details.

       --protocol=NUM
              Force an older protocol version to be used.  This is useful  for
              creating  a  batch file that is compatible with an older version
              of rsync.  For instance, if rsync 2.6.4 is being used  with  the
              --write-batch  option,  but  rsync 2.6.3 is what will be used to
              run the --read-batch option, you should use "--protocol=28" when
              creating  the  batch file to force the older protocol version to
              be used in the batch file (assuming you can't upgrade the  rsync
              on the reading system).

       --iconv=CONVERT_SPEC
              Rsync  can  convert  filenames between character sets using this
              option.  Using a CONVERT_SPEC of "." tells rsync to look up  the
              default  character-set via the locale setting.  Alternately, you
              can fully specify what conversion to do by giving a local and  a
              remote   charset   separated   by   a   comma   in   the   order
              --iconv=LOCAL,REMOTE, e.g.  --iconv=utf8,iso88591.   This  order
              ensures  that the option will stay the same whether you're push-
              ing or pulling files.  Finally, you  can  specify  either  --no-
              iconv  or a CONVERT_SPEC of "-" to turn off any conversion.  The
              default setting of this option is site-specific, and can also be
              affected via the RSYNC_ICONV environment variable.

              For  a  list of what charset names your local iconv library sup-
              ports, you can run "iconv --list".

              If you specify the --protect-args option (-s), rsync will trans-
              late  the  filenames  you  specify  on the command-line that are
              being sent to  the  remote  host.   See  also  the  --files-from
              option.

              Note  that  rsync  does not do any conversion of names in filter
              files (including include/exclude files).  It is  up  to  you  to
              ensure  that  you're specifying matching rules that can match on
              both sides of the transfer.  For instance, you can specify extra
              include/exclude  rules  if there are filename differences on the
              two sides that need to be accounted for.

              When you pass an --iconv option to an rsync daemon  that  allows
              it,  the daemon uses the charset specified in its "charset" con-
              figuration parameter regardless of the remote charset you  actu-
              ally  pass.   Thus,  you may feel free to specify just the local
              charset for a daemon transfer (e.g.  --iconv=utf8).

       --ipv4, -4 or --ipv6, -6
              Tells rsync to prefer IPv4/IPv6 when creating sockets or running
              ssh.   This  affects sockets that rsync has direct control over,
              such as the outgoing socket when directly  contacting  an  rsync
              daemon,  as well as the forwarding of the -4 or -6 option to ssh
              when rsync can deduce that ssh  is  being  used  as  the  remote
              shell.   For  other  remote  shells  you'll  need to specify the
              "--rsh SHELL -4" option directly  (or  whatever  ipv4/ipv6  hint
              options it uses).

              These options also exist in the --daemon mode section.

              If  rsync  was  complied  without  support  for IPv6, the --ipv6
              option will have no effect.   The  rsync --version  output  will
              contain "no IPv6" if is the case.

       --checksum-seed=NUM
              Set  the checksum seed to the integer NUM.  This 4 byte checksum
              seed is included in each block and MD4 file checksum calculation
              (the  more  modern  MD5  file  checksums  don't use a seed).  By
              default the  checksum  seed  is  generated  by  the  server  and
              defaults  to  the  current time().  This option is used to set a
              specific checksum seed, which is useful  for  applications  that
              want  repeatable  block checksums, or in the case where the user
              wants a more random checksum seed.   Setting  NUM  to  0  causes
              rsync to use the default of time() for checksum seed.



DAEMON OPTIONS

       The options allowed when starting an rsync daemon are as follows:


       --daemon
              This  tells rsync that it is to run as a daemon.  The daemon you
              start running may be accessed using an rsync  client  using  the
              host::module or rsync://host/module/ syntax.

              If  standard input is a socket then rsync will assume that it is
              being run via inetd, otherwise it will detach from  the  current
              terminal  and  become a background daemon.  The daemon will read
              the config file (rsyncd.conf) on each connect made by  a  client
              and respond to requests accordingly.  See the rsyncd.conf(5) man
              page for more details.

       --address=ADDRESS
              By default rsync will bind to the wildcard address when run as a
              daemon  with  the  --daemon option.  The --address option allows
              you to specify a specific IP address (or hostname) to  bind  to.
              This  makes  virtual  hosting  possible  in conjunction with the
              --config option.  See also the "address" global  option  in  the
              rsyncd.conf manpage.

       --bwlimit=RATE
              This  option allows you to specify the maximum transfer rate for
              the data the daemon sends over the socket.  The client can still
              specify  a  smaller --bwlimit value, but no larger value will be
              allowed.  See the client version of this option (above) for some
              extra details.

       --config=FILE
              This  specifies an alternate config file than the default.  This
              is only relevant when --daemon is  specified.   The  default  is
              /etc/rsyncd.conf  unless  the  daemon  is  running over a remote
              shell program and the remote user is not the super-user; in that
              case  the default is rsyncd.conf in the current directory (typi-
              cally $HOME).

       --dparam=OVERRIDE, -M
              This option can be used to set a  daemon-config  parameter  when
              starting  up  rsync  in daemon mode.  It is equivalent to adding
              the parameter at the end of the global  settings  prior  to  the
              first module's definition.  The parameter names can be specified
              without spaces, if you so desire.  For instance:

                  rsync --daemon -M pidfile=/path/rsync.pid

       --no-detach
              When running as a daemon, this option  instructs  rsync  to  not
              detach  itself  and become a background process.  This option is
              required when running as a service on Cygwin, and  may  also  be
              useful when rsync is supervised by a program such as daemontools
              or AIX's System Resource Controller.  --no-detach is also recom-
              mended  when  rsync is run under a debugger.  This option has no
              effect if rsync is run from inetd or sshd.

       --port=PORT
              This specifies an alternate TCP port number for  the  daemon  to
              listen  on  rather than the default of 873.  See also the "port"
              global option in the rsyncd.conf manpage.

       --log-file=FILE
              This option tells the rsync daemon to  use  the  given  log-file
              name instead of using the "log file" setting in the config file.

       --log-file-format=FORMAT
              This option tells the rsync  daemon  to  use  the  given  FORMAT
              string  instead  of using the "log format" setting in the config
              file.  It also enables "transfer logging" unless the  string  is
              empty, in which case transfer logging is turned off.

       --sockopts
              This  overrides  the  socket options  setting in the rsyncd.conf
              file and has the same syntax.

       --verbose, -v
              This option increases the amount of information the daemon  logs
              during  its  startup phase.  After the client connects, the dae-
              mon's verbosity level will be controlled by the options that the
              client used and the "max verbosity" setting in the module's con-
              fig section.

       --ipv4, -4 or --ipv6, -6
              Tells rsync to prefer IPv4/IPv6 when creating the incoming sock-
              ets  that  the  rsync daemon will use to listen for connections.
              One of these options may be required in older versions of  Linux
              to work around an IPv6 bug in the kernel (if you see an "address
              already in use" error when nothing else is using the  port,  try
              specifying --ipv6 or --ipv4 when starting the daemon).

              These options also exist in the regular rsync options section.

              If  rsync  was  complied  without  support  for IPv6, the --ipv6
              option will have no effect.   The  rsync --version  output  will
              contain "no IPv6" if is the case.

       --help, -h
              When  specified after --daemon, print a short help page describ-
              ing the options available for starting an rsync daemon.



FILTER RULES

       The filter rules allow for flexible selection of which files to  trans-
       fer  (include)  and  which  files  to skip (exclude).  The rules either
       directly specify include/exclude patterns or  they  specify  a  way  to
       acquire  more include/exclude patterns (e.g. to read them from a file).

       As the list of files/directories to transfer  is  built,  rsync  checks
       each  name  to  be transferred against the list of include/exclude pat-
       terns in turn, and the first matching pattern is acted on: if it is  an
       exclude pattern, then that file is skipped; if it is an include pattern
       then that filename is not skipped; if no  matching  pattern  is  found,
       then the filename is not skipped.

       Rsync  builds  an ordered list of filter rules as specified on the com-
       mand-line.  Filter rules have the following syntax:

           RULE [PATTERN_OR_FILENAME]
           RULE,MODIFIERS [PATTERN_OR_FILENAME]

       You have your choice of using either  short  or  long  RULE  names,  as
       described below.  If you use a short-named rule, the ',' separating the
       RULE from the MODIFIERS is optional.  The PATTERN or FILENAME that fol-
       lows  (when present) must come after either a single space or an under-
       score (_).  Here are the available rule prefixes:


       exclude, '-'
              specifies an exclude pattern.

       include, '+'
              specifies an include pattern.

       merge, '.'
              specifies a merge-file to read for more rules.

       dir-merge, ':'
              specifies a per-directory merge-file.

       hide, 'H'
              specifies a pattern for hiding files from the transfer.

       show, 'S'
              files that match the pattern are not hidden.

       protect, 'P'
              specifies a pattern for protecting files from deletion.

       risk, 'R'
              files that match the pattern are not protected.

       clear, '!'
              clears the current include/exclude list (takes no arg)

       When rules are being read from a file, empty lines are ignored, as  are
       comment lines that start with a "#".

       Note  that  the --include & --exclude command-line options do not allow
       the full range of rule parsing as described above --  they  only  allow
       the  specification  of  include  / exclude patterns plus a "!" token to
       clear the list (and the normal comment parsing when rules are read from
       a  file).   If a pattern does not begin with "- " (dash, space) or "+ "
       (plus, space), then the rule will be interpreted as  if  "+ "  (for  an
       include  option)  or  "- " (for an exclude option) were prefixed to the
       string.  A --filter option, on the  other  hand,  must  always  contain
       either a short or long rule name at the start of the rule.

       Note  also that the --filter, --include, and --exclude options take one
       rule/pattern each.  To add multiple ones, you can repeat the options on
       the  command-line, use the merge-file syntax of the --filter option, or
       the --include-from / --exclude-from options.



INCLUDE/EXCLUDE PATTERN RULES

       You can include and exclude files by specifying patterns using the "+",
       "-",  etc.  filter  rules  (as  introduced  in the FILTER RULES section
       above).  The include/exclude rules  each  specify  a  pattern  that  is
       matched  against  the  names  of  the files that are going to be trans-
       ferred.  These patterns can take several forms:


       o      if the pattern starts with a / then it is anchored to a particu-
              lar  spot  in  the  hierarchy  of files, otherwise it is matched
              against the end of the pathname.  This is similar to a leading ^
              in  regular  expressions.  Thus /foo would match a name of "foo"
              at either the "root of the transfer" (for a global rule)  or  in
              the  merge-file's  directory  (for  a  per-directory  rule).  An
              unqualified foo would match a name of "foo" anywhere in the tree
              because  the algorithm is applied recursively from the top down;
              it behaves as if each path component gets a turn  at  being  the
              end  of the filename.  Even the unanchored "sub/foo" would match
              at any point in the hierarchy where a "foo" was found  within  a
              directory   named   "sub".    See   the   section  on  ANCHORING
              INCLUDE/EXCLUDE PATTERNS for a full discussion of how to specify
              a pattern that matches at the root of the transfer.

       o      if  the  pattern  ends with a / then it will only match a direc-
              tory, not a regular file, symlink, or device.

       o      rsync chooses between doing a simple string match  and  wildcard
              matching  by checking if the pattern contains one of these three
              wildcard characters: '*', '?', and '[' .

       o      a '*' matches any path component, but it stops at slashes.

       o      use '**' to match anything, including slashes.

       o      a '?' matches any character except a slash (/).

       o      a  '['  introduces  a  character  class,  such   as   [a-z]   or
              [[:alpha:]].

       o      in a wildcard pattern, a backslash can be used to escape a wild-
              card character, but it is matched literally  when  no  wildcards
              are  present.   This means that there is an extra level of back-
              slash removal when a pattern contains wildcard  characters  com-
              pared to a pattern that has none.  e.g. if you add a wildcard to
              "foo\bar" (which matches the backslash) you would  need  to  use
              "foo\\bar*" to avoid the "\b" becoming just "b".

       o      if  the  pattern  contains  a / (not counting a trailing /) or a
              "**", then it is matched against the  full  pathname,  including
              any  leading directories.  If the pattern doesn't contain a / or
              a "**", then it is matched only against the final  component  of
              the  filename.  (Remember  that  the algorithm is applied recur-
              sively so "full filename" can actually be any portion of a  path
              from the starting directory on down.)

       o      a  trailing  "dir_name/***" will match both the directory (as if
              "dir_name/" had been specified) and everything in the  directory
              (as  if  "dir_name/**"  had  been specified).  This behavior was
              added in version 2.6.7.

       Note that, when using the --recursive (-r) option (which is implied  by
       -a),  every  subdir  component  of every path is visited left to right,
       with each directory having a chance for exclusion before  its  content.
       In  this  way  include/exclude  patterns are applied recursively to the
       pathname of each node in the filesystem's tree (those inside the trans-
       fer).  The exclude patterns short-circuit the directory traversal stage
       as rsync finds the files to send.

       For instance, to include "/foo/bar/baz",  the  directories  "/foo"  and
       "/foo/bar"  must not be excluded.  Excluding one of those parent direc-
       tories prevents the examination of its  content,  cutting  off  rsync's
       recursion into those paths and rendering the include for "/foo/bar/baz"
       ineffectual (since rsync can't match something it  never  sees  in  the
       cut-off section of the directory hierarchy).

       The  concept  path  exclusion  is  particularly  important when using a
       trailing '*' rule.  For instance, this won't work:

           + /some/path/this-file-will-not-be-found
           + /file-is-included
           - *

       This fails because the parent directory "some" is excluded by  the  '*'
       rule,  so  rsync  never  visits  any  of  the  files  in  the "some" or
       "some/path" directories.  One solution is to ask for all directories in
       the  hierarchy  to  be  included by using a single rule: "+ */" (put it
       somewhere before the "- *" rule), and perhaps  use  the  --prune-empty-
       dirs option.  Another solution is to add specific include rules for all
       the parent dirs that need to be visited.  For  instance,  this  set  of
       rules works fine:

           + /some/
           + /some/path/
           + /some/path/this-file-is-found
           + /file-also-included
           - *

       Here are some examples of exclude/include matching:


       o      "- *.o" would exclude all names matching *.o

       o      "- /foo"  would  exclude  a file (or directory) named foo in the
              transfer-root directory

       o      "- foo/" would exclude any directory named foo

       o      "- /foo/*/bar" would exclude any file named bar which is at  two
              levels  below  a directory named foo in the transfer-root direc-
              tory

       o      "- /foo/**/bar" would exclude any file named  bar  two  or  more
              levels  below  a directory named foo in the transfer-root direc-
              tory

       o      The combination of "+ */", "+ *.c", and "- *" would include  all
              directories  and  C  source files but nothing else (see also the
              --prune-empty-dirs option)

       o      The combination of  "+ foo/",  "+ foo/bar.c",  and  "- *"  would
              include  only the foo directory and foo/bar.c (the foo directory
              must be explicitly included or it would be excluded by the "*")

       The following modifiers are accepted after a "+" or "-":


       o      A / specifies that the include/exclude rule  should  be  matched
              against the absolute pathname of the current item.  For example,
              "-/ /etc/passwd" would exclude the  passwd  file  any  time  the
              transfer  was  sending  files from the "/etc" directory, and "-/
              subdir/foo" would always exclude "foo" when it is in a dir named
              "subdir",  even if "foo" is at the root of the current transfer.

       o      A ! specifies that the include/exclude should take effect if the
              pattern fails to match.  For instance, "-! */" would exclude all
              non-directories.

       o      A C is used to indicate that all the  global  CVS-exclude  rules
              should  be  inserted  as  excludes in place of the "-C".  No arg
              should follow.

       o      An s is used to indicate that the rule applies  to  the  sending
              side.   When  a rule affects the sending side, it prevents files
              from being transferred.  The default is for  a  rule  to  affect
              both sides unless --delete-excluded was specified, in which case
              default rules become sender-side only.  See also  the  hide  (H)
              and  show (S) rules, which are an alternate way to specify send-
              ing-side includes/excludes.

       o      An r is used to indicate that the rule applies to the  receiving
              side.  When a rule affects the receiving side, it prevents files
              from being deleted.  See the s modifier for more info.  See also
              the  protect  (P) and risk (R) rules, which are an alternate way
              to specify receiver-side includes/excludes.

       o      A p indicates that a rule is  perishable,  meaning  that  it  is
              ignored  in  directories  that are being deleted.  For instance,
              the -C option's default rules that exclude things like "CVS" and
              "*.o" are marked as perishable, and will not prevent a directory
              that was removed on the source from being deleted on the  desti-
              nation.

       o      An  x  indicates  that  a  rule  affects  xattr  names  in xattr
              copy/delete  operations  (and  is  thus  ignored  when  matching
              file/dir  names).   If  no xattr-matching rules are specified, a
              default xattr filtering rule is used (see the --xattrs  option).



MERGE-FILE FILTER RULES

       You can merge whole files into your filter rules by specifying either a
       merge (.) or a dir-merge (:) filter rule (as introduced in  the  FILTER
       RULES section above).

       There  are  two kinds of merged files -- single-instance ('.') and per-
       directory (':').  A single-instance merge file is read  one  time,  and
       its rules are incorporated into the filter list in the place of the "."
       rule.  For per-directory merge files, rsync will scan  every  directory
       that  it  traverses  for  the named file, merging its contents when the
       file exists into the current list of inherited rules.  These per-direc-
       tory  rule  files must be created on the sending side because it is the
       sending side that is being scanned for the available files to transfer.
       These  rule files may also need to be transferred to the receiving side
       if you want them to affect what files don't get deleted (see PER-DIREC-
       TORY RULES AND DELETE below).

       Some examples:

           merge /etc/rsync/default.rules
           . /etc/rsync/default.rules
           dir-merge .per-dir-filter
           dir-merge,n- .non-inherited-per-dir-excludes
           :n- .non-inherited-per-dir-excludes

       The following modifiers are accepted after a merge or dir-merge rule:


       o      A  - specifies that the file should consist of only exclude pat-
              terns, with no other rule-parsing except for in-file comments.

       o      A + specifies that the file should consist of only include  pat-
              terns, with no other rule-parsing except for in-file comments.

       o      A  C  is a way to specify that the file should be read in a CVS-
              compatible manner.  This turns on 'n', 'w', and  '-',  but  also
              allows the list-clearing token (!) to be specified.  If no file-
              name is provided, ".cvsignore" is assumed.

       o      A e will exclude the merge-file name  from  the  transfer;  e.g.
              "dir-merge,e  .rules" is like "dir-merge .rules" and "- .rules".

       o      An n specifies that the rules are not inherited  by  subdirecto-
              ries.

       o      A  w  specifies  that  the  rules  are  word-split on whitespace
              instead of the normal line-splitting.  This also turns off  com-
              ments.   Note: the space that separates the prefix from the rule
              is treated specially, so "- foo + bar" is parsed  as  two  rules
              (assuming that prefix-parsing wasn't also disabled).

       o      You  may  also  specify  any of the modifiers for the "+" or "-"
              rules (above) in order to have the rules that are read  in  from
              the  file  default to having that modifier set (except for the !
              modifier, which would not be useful).  For  instance,  "merge,-/
              .excl"  would  treat  the  contents  of  .excl  as absolute-path
              excludes, while "dir-merge,s .filt" and ":sC"  would  each  make
              all  their  per-directory  rules apply only on the sending side.
              If the merge rule specifies sides to affect (via the s or r mod-
              ifier  or  both),  then  the  rules in the file must not specify
              sides (via a modifier or a rule prefix such as hide).

       Per-directory rules are inherited in all subdirectories of  the  direc-
       tory  where  the merge-file was found unless the 'n' modifier was used.
       Each subdirectory's rules are prefixed to the  inherited  per-directory
       rules  from its parents, which gives the newest rules a higher priority
       than the inherited rules.   The  entire  set  of  dir-merge  rules  are
       grouped  together in the spot where the merge-file was specified, so it
       is possible to override dir-merge rules via a rule that  got  specified
       earlier in the list of global rules.  When the list-clearing rule ("!")
       is read from a per-directory file, it only clears the  inherited  rules
       for the current merge file.

       Another  way  to prevent a single rule from a dir-merge file from being
       inherited is to anchor it with a leading slash.  Anchored  rules  in  a
       per-directory merge-file are relative to the merge-file's directory, so
       a pattern "/foo" would only match the file "foo" in the directory where
       the dir-merge filter file was found.

       Here's   an   example  filter  file  which  you'd  specify  via  --fil-
       ter=". file":

           merge /home/user/.global-filter
           - *.gz
           dir-merge .rules
           + *.[ch]
           - *.o
           - foo*

       This will merge the contents of the /home/user/.global-filter  file  at
       the  start of the list and also turns the ".rules" filename into a per-
       directory filter file.  All rules read in prior to  the  start  of  the
       directory  scan follow the global anchoring rules (i.e. a leading slash
       matches at the root of the transfer).

       If a per-directory merge-file is specified with a path that is a parent
       directory of the first transfer directory, rsync will scan all the par-
       ent dirs from that starting point to the  transfer  directory  for  the
       indicated  per-directory  file.   For instance, here is a common filter
       (see -F):

           --filter=': /.rsync-filter'

       That rule tells rsync to scan for the file .rsync-filter in all  direc-
       tories  from the root down through the parent directory of the transfer
       prior to the start of the normal directory scan  of  the  file  in  the
       directories  that  are  sent  as  a part of the transfer. (Note: for an
       rsync daemon, the root is always the same as the module's "path".)

       Some examples of this pre-scanning for per-directory files:

           rsync -avF /src/path/ /dest/dir
           rsync -av --filter=': ../../.rsync-filter' /src/path/ /dest/dir
           rsync -av --filter=': .rsync-filter' /src/path/ /dest/dir

       The first two commands above will look for ".rsync-filter" in  "/"  and
       "/src"   before  the  normal  scan  begins  looking  for  the  file  in
       "/src/path" and its subdirectories.  The last command avoids  the  par-
       ent-dir  scan  and  only  looks  for  the ".rsync-filter" files in each
       directory that is a part of the transfer.

       If you want to include the contents of a ".cvsignore" in your patterns,
       you  should use the rule ":C", which creates a dir-merge of the .cvsig-
       nore file, but parsed in a CVS-compatible manner.  You can use this  to
       affect  where  the  --cvs-exclude  (-C)  option's inclusion of the per-
       directory .cvsignore file gets placed into your rules  by  putting  the
       ":C" wherever you like in your filter rules.  Without this, rsync would
       add the dir-merge rule for the .cvsignore file at the end of  all  your
       other  rules (giving it a lower priority than your command-line rules).
       For example:

           cat <<EOT | rsync -avC --filter='. -' a/ b
           + foo.o
           :C
           - *.old
           EOT
           rsync -avC --include=foo.o -f :C --exclude='*.old' a/ b

       Both of the above rsync commands are identical.  Each  one  will  merge
       all the per-directory .cvsignore rules in the middle of the list rather
       than at the end.  This allows their dir-specific rules to supersede the
       rules  that  follow  the  :C  instead  of being subservient to all your
       rules.  To affect the other CVS exclude rules (i.e. the default list of
       exclusions,  the contents of $HOME/.cvsignore, and the value of $CVSIG-
       NORE) you should omit the -C command-line option and instead  insert  a
       "-C" rule into your filter rules; e.g.  "--filter=-C".



LIST-CLEARING FILTER RULE

       You  can clear the current include/exclude list by using the "!" filter
       rule (as introduced in the FILTER RULES section above).  The  "current"
       list  is  either  the  global list of rules (if the rule is encountered
       while parsing the filter options)  or  a  set  of  per-directory  rules
       (which  are  inherited in their own sub-list, so a subdirectory can use
       this to clear out the parent's rules).



ANCHORING INCLUDE/EXCLUDE PATTERNS

       As mentioned earlier, global include/exclude patterns are  anchored  at
       the "root of the transfer" (as opposed to per-directory patterns, which
       are anchored at the merge-file's  directory).   If  you  think  of  the
       transfer  as  a  subtree  of  names  that are being sent from sender to
       receiver, the transfer-root is where the tree starts to  be  duplicated
       in  the  destination  directory.  This root governs where patterns that
       start with a / match.

       Because the matching is relative to  the  transfer-root,  changing  the
       trailing  slash on a source path or changing your use of the --relative
       option affects the path you need to use in your matching  (in  addition
       to  changing how much of the file tree is duplicated on the destination
       host).  The following examples demonstrate this.

       Let's say that we want to match two source files, one with an  absolute
       path of "/home/me/foo/bar", and one with a path of "/home/you/bar/baz".
       Here is how the various command choices differ for a 2-source transfer:

           Example cmd: rsync -a /home/me /home/you /dest
           +/- pattern: /me/foo/bar
           +/- pattern: /you/bar/baz
           Target file: /dest/me/foo/bar
           Target file: /dest/you/bar/baz

           Example cmd: rsync -a /home/me/ /home/you/ /dest
           +/- pattern: /foo/bar               (note missing "me")
           +/- pattern: /bar/baz               (note missing "you")
           Target file: /dest/foo/bar
           Target file: /dest/bar/baz

           Example cmd: rsync -a --relative /home/me/ /home/you /dest
           +/- pattern: /home/me/foo/bar       (note full path)
           +/- pattern: /home/you/bar/baz      (ditto)
           Target file: /dest/home/me/foo/bar
           Target file: /dest/home/you/bar/baz

           Example cmd: cd /home; rsync -a --relative me/foo you/ /dest
           +/- pattern: /me/foo/bar      (starts at specified path)
           +/- pattern: /you/bar/baz     (ditto)
           Target file: /dest/me/foo/bar
           Target file: /dest/you/bar/baz

       The  easiest  way to see what name you should filter is to just look at
       the output when using --verbose and put a / in front of the  name  (use
       the --dry-run option if you're not yet ready to copy any files).



PER-DIRECTORY RULES AND DELETE

       Without  a  delete option, per-directory rules are only relevant on the
       sending side, so you can feel free to exclude  the  merge  files  them-
       selves without affecting the transfer.  To make this easy, the 'e' mod-
       ifier adds this exclude for you, as seen in these two  equivalent  com-
       mands:

           rsync -av --filter=': .excl' --exclude=.excl host:src/dir /dest
           rsync -av --filter=':e .excl' host:src/dir /dest

       However,  if you want to do a delete on the receiving side AND you want
       some files to be excluded from being deleted, you'll need  to  be  sure
       that  the  receiving side knows what files to exclude.  The easiest way
       is to include the per-directory merge files in  the  transfer  and  use
       --delete-after,  because  this ensures that the receiving side gets all
       the same exclude rules as the sending side before it  tries  to  delete
       anything:

           rsync -avF --delete-after host:src/dir /dest

       However, if the merge files are not a part of the transfer, you'll need
       to either specify some global exclude rules (i.e. specified on the com-
       mand  line),  or  you'll  need to maintain your own per-directory merge
       files on the receiving side.  An example of the first is  this  (assume
       that the remote .rules files exclude themselves):

           rsync -av --filter=': .rules' --filter='. /my/extra.rules'
              --delete host:src/dir /dest

       In  the above example the extra.rules file can affect both sides of the
       transfer, but (on the sending side) the rules are  subservient  to  the
       rules  merged  from  the .rules files because they were specified after
       the per-directory merge rule.

       In one final example, the remote side is  excluding  the  .rsync-filter
       files from the transfer, but we want to use our own .rsync-filter files
       to control what gets deleted on the receiving side.  To do this we must
       specifically  exclude the per-directory merge files (so that they don't
       get deleted) and then put rules into the local files  to  control  what
       else should not get deleted.  Like one of these commands:

           rsync -av --filter=':e /.rsync-filter' --delete \
               host:src/dir /dest
           rsync -avFF --delete host:src/dir /dest



BATCH MODE

       Batch mode can be used to apply the same set of updates to many identi-
       cal systems.  Suppose one has a tree which is replicated on a number of
       hosts.  Now suppose some changes have been made to this source tree and
       those changes need to be propagated to the other hosts.  In order to do
       this  using  batch  mode,  rsync  is run with the write-batch option to
       apply the changes made to the source tree to  one  of  the  destination
       trees.   The  write-batch  option causes the rsync client to store in a
       "batch file" all  the  information  needed  to  repeat  this  operation
       against other, identical destination trees.

       Generating the batch file once saves having to perform the file status,
       checksum, and data block generation more than once when updating multi-
       ple  destination  trees.   Multicast transport protocols can be used to
       transfer the batch update files in parallel  to  many  hosts  at  once,
       instead of sending the same data to every host individually.

       To  apply  the  recorded changes to another destination tree, run rsync
       with the read-batch option, specifying the name of the same batch file,
       and the destination tree.  Rsync updates the destination tree using the
       information stored in the batch file.

       For your convenience, a script file is also  created  when  the  write-
       batch  option is used: it will be named the same as the batch file with
       ".sh" appended.  This script file contains a command-line suitable  for
       updating a destination tree using the associated batch file.  It can be
       executed using a Bourne (or Bourne-like) shell, optionally  passing  in
       an  alternate  destination  tree pathname which is then used instead of
       the original destination path.  This is  useful  when  the  destination
       tree  path  on the current host differs from the one used to create the
       batch file.

       Examples:

           $ rsync --write-batch=foo -a host:/source/dir/ /adest/dir/
           $ scp foo* remote:
           $ ssh remote ./foo.sh /bdest/dir/

           $ rsync --write-batch=foo -a /source/dir/ /adest/dir/
           $ ssh remote rsync --read-batch=- -a /bdest/dir/ <foo

       In  these  examples,  rsync  is  used  to   update   /adest/dir/   from
       /source/dir/  and the information to repeat this operation is stored in
       "foo" and "foo.sh".  The host "remote" is then updated with the batched
       data  going into the directory /bdest/dir.  The differences between the
       two examples reveals some of the flexibility you have in how  you  deal
       with batches:


       o      The first example shows that the initial copy doesn't have to be
              local -- you can push or pull data to/from a remote  host  using
              either  the  remote-shell  syntax  or  rsync  daemon  syntax, as
              desired.

       o      The first example uses the created  "foo.sh"  file  to  get  the
              right  rsync  options when running the read-batch command on the
              remote host.

       o      The second example reads the batch data via  standard  input  so
              that  the  batch  file  doesn't  need to be copied to the remote
              machine first.  This example avoids the foo.sh script because it
              needed to use a modified --read-batch option, but you could edit
              the script file if you wished to make use of it  (just  be  sure
              that  no  other  option is trying to use standard input, such as
              the "--exclude-from=-" option).

       Caveats:

       The read-batch option expects the destination tree that it is  updating
       to  be  identical  to  the destination tree that was used to create the
       batch update fileset.  When a difference between the destination  trees
       is  encountered  the  update  might be discarded with a warning (if the
       file appears to be  up-to-date  already)  or  the  file-update  may  be
       attempted  and  then, if the file fails to verify, the update discarded
       with an error.  This means that it should be safe  to  re-run  a  read-
       batch  operation  if the command got interrupted.  If you wish to force
       the batched-update to always be attempted regardless of the file's size
       and  date,  use  the  -I  option (when reading the batch).  If an error
       occurs, the destination tree will probably be in  a  partially  updated
       state.  In that case, rsync can be used in its regular (non-batch) mode
       of operation to fix up the destination tree.

       The rsync version used on all destinations must be at least as  new  as
       the  one used to generate the batch file.  Rsync will die with an error
       if the protocol version in the batch file is too  new  for  the  batch-
       reading  rsync  to handle.  See also the --protocol option for a way to
       have the creating rsync generate a batch file that an older  rsync  can
       understand.  (Note that batch files changed format in version 2.6.3, so
       mixing versions older than that with newer versions will not work.)

       When reading a batch file,  rsync  will  force  the  value  of  certain
       options  to  match the data in the batch file if you didn't set them to
       the same as the batch-writing command.  Other options can (and  should)
       be  changed.   For  instance  --write-batch  changes  to  --read-batch,
       --files-from is dropped, and  the  --filter  /  --include  /  --exclude
       options are not needed unless one of the --delete options is specified.

       The  code  that  creates  the  BATCH.sh  file   transforms   any   fil-
       ter/include/exclude  options  into  a single list that is appended as a
       "here" document to the shell script file.  An  advanced  user  can  use
       this  to  modify  the  exclude list if a change in what gets deleted by
       --delete is desired.  A normal user can ignore this detail and just use
       the  shell  script  as  an easy way to run the appropriate --read-batch
       command for the batched data.

       The original batch mode in rsync was based on "rsync+", but the  latest
       version uses a new implementation.



SYMBOLIC LINKS

       Three  basic  behaviors  are  possible when rsync encounters a symbolic
       link in the source directory.

       By default, symbolic links are  not  transferred  at  all.   A  message
       "skipping non-regular" file is emitted for any symlinks that exist.

       If --links is specified, then symlinks are recreated with the same tar-
       get on the destination.  Note that --archive implies --links.

       If --copy-links is specified, then symlinks are "collapsed" by  copying
       their referent, rather than the symlink.

       Rsync  can  also  distinguish  "safe"  and "unsafe" symbolic links.  An
       example where this might be used is a web site mirror  that  wishes  to
       ensure  that  the rsync module that is copied does not include symbolic
       links to /etc/passwd in the public section of the site.  Using  --copy-
       unsafe-links  will  cause any links to be copied as the file they point
       to on the destination.  Using --safe-links will cause unsafe  links  to
       be  omitted altogether. (Note that you must specify --links for --safe-
       links to have any effect.)

       Symbolic links are considered unsafe  if  they  are  absolute  symlinks
       (start  with  /),  empty, or if they contain enough ".."  components to
       ascend from the directory being copied.

       Here's a summary of how the symlink options are interpreted.  The  list
       is in order of precedence, so if your combination of options isn't men-
       tioned, use the first line that is a complete subset of your options:


       --copy-links
              Turn all symlinks into normal files (leaving no symlinks for any
              other options to affect).

       --links --copy-unsafe-links
              Turn  all unsafe symlinks into files and duplicate all safe sym-
              links.

       --copy-unsafe-links
              Turn all unsafe symlinks into files, noisily skip all safe  sym-
              links.

       --links --safe-links
              Duplicate safe symlinks and skip unsafe ones.

       --links
              Duplicate all symlinks.



DIAGNOSTICS

       rsync occasionally produces error messages that may seem a little cryp-
       tic.  The one that seems to cause the most confusion is "protocol  ver-
       sion mismatch -- is your shell clean?".

       This  message is usually caused by your startup scripts or remote shell
       facility producing unwanted garbage on the stream that rsync  is  using
       for  its  transport.   The  way to diagnose this problem is to run your
       remote shell like this:

           ssh remotehost /bin/true > out.dat

       then look at out.dat.  If everything is working correctly then  out.dat
       should  be a zero length file.  If you are getting the above error from
       rsync then you will probably find that out.dat contains  some  text  or
       data.   Look  at the contents and try to work out what is producing it.
       The most common cause is incorrectly configured shell  startup  scripts
       (such  as  .cshrc  or .profile) that contain output statements for non-
       interactive logins.

       If you are having trouble debugging filter patterns, then try  specify-
       ing  the  -vv  option.   At this level of verbosity rsync will show why
       each individual file is included or excluded.



EXIT VALUES

       0      Success

       1      Syntax or usage error

       2      Protocol incompatibility

       3      Errors selecting input/output files, dirs

       4      Requested action not supported: an attempt was made  to  manipu-
              late  64-bit files on a platform that cannot support them; or an
              option was specified that is supported by the client and not  by
              the server.

       5      Error starting client-server protocol

       6      Daemon unable to append to log-file

       10     Error in socket I/O

       11     Error in file I/O

       12     Error in rsync protocol data stream

       13     Errors with program diagnostics

       14     Error in IPC code

       20     Received SIGUSR1 or SIGINT

       21     Some error returned by waitpid()

       22     Error allocating core memory buffers

       23     Partial transfer due to error

       24     Partial transfer due to vanished source files

       25     The --max-delete limit stopped deletions

       30     Timeout in data send/receive

       35     Timeout waiting for daemon connection



ENVIRONMENT VARIABLES

       CVSIGNORE
              The  CVSIGNORE  environment variable supplements any ignore pat-
              terns in .cvsignore files.  See  the  --cvs-exclude  option  for
              more details.

       RSYNC_ICONV
              Specify  a  default --iconv setting using this environment vari-
              able. (First supported in 3.0.0.)

       RSYNC_PROTECT_ARGS
              Specify a non-zero numeric value if you want the  --protect-args
              option  to  be  enabled by default, or a zero value to make sure
              that it is disabled by default. (First supported in 3.1.0.)

       RSYNC_RSH
              The RSYNC_RSH environment variable allows you  to  override  the
              default  shell  used  as  the transport for rsync.  Command line
              options are permitted after the command name, just as in the  -e
              option.

       RSYNC_PROXY
              The RSYNC_PROXY environment variable allows you to redirect your
              rsync client to use a web proxy when connecting to a rsync  dae-
              mon.  You should set RSYNC_PROXY to a hostname:port pair.

       RSYNC_PASSWORD
              Setting  RSYNC_PASSWORD  to  the required password allows you to
              run authenticated rsync connections to an rsync  daemon  without
              user intervention.  Note that this does not supply a password to
              a remote shell transport such as ssh; to learn how to  do  that,
              consult the remote shell's documentation.

       USER or LOGNAME
              The  USER or LOGNAME environment variables are used to determine
              the default username sent to an rsync  daemon.   If  neither  is
              set, the username defaults to "nobody".

       HOME   The HOME environment variable is used to find the user's default
              .cvsignore file.



FILES

       /etc/rsyncd.conf or rsyncd.conf



SEE ALSO

       rsync-ssl(1), rsyncd.conf(5)



BUGS

       times are transferred as *nix time_t values

       When transferring to  FAT  filesystems  rsync  may  re-sync  unmodified
       files.  See the comments on the --modify-window option.

       file  permissions,  devices,  etc.  are transferred as native numerical
       values

       see also the comments on the --delete option

       Please report bugs! See the web site at https://rsync.samba.org/.



VERSION

       This man page is current for version 3.2.3 of rsync.



INTERNAL OPTIONS

       The options --server and --sender are used  internally  by  rsync,  and
       should  never  be  typed  by  a  user under normal circumstances.  Some
       awareness of these options may be needed in certain scenarios, such  as
       when  setting  up  a  login  that  can  only run an rsync command.  For
       instance, the support directory of the rsync distribution has an  exam-
       ple  script named rrsync (for restricted rsync) that can be used with a
       restricted ssh login.



CREDITS

       rsync is distributed under the GNU General  Public  License.   See  the
       file COPYING for details.

       A web site is available at https://rsync.samba.org/.  The site includes
       an FAQ-O-Matic which may cover  questions  unanswered  by  this  manual
       page.

       We  would  be  delighted  to  hear  from  you if you like this program.
       Please contact the mailing-list at rsync@lists.samba.org.

       This program uses the excellent zlib  compression  library  written  by
       Jean-loup Gailly and Mark Adler.



THANKS

       Special  thanks  go  out  to: John Van Essen, Matt McCutchen, Wesley W.
       Terpstra, David Dykstra, Jos Backus, Sebastian  Krahmer,  Martin  Pool,
       and our gone-but-not-forgotten compadre, J.W. Schultz.

       Thanks also to Richard Brent, Brendan Mackay, Bill Waite, Stephen Roth-
       well and David Bell.  I've probably missed some people, my apologies if
       I have.



AUTHOR

       rsync  was  originally  written  by Andrew Tridgell and Paul Mackerras.
       Many people have later contributed to it. It is currently maintained by
       Wayne Davison.

       Mailing   lists   for   support   and   development  are  available  at
       https://lists.samba.org/.



rsync 3.2.3                       06 Aug 2020                         rsync(1)

rsync 3.2.3 - Generated Thu Sep 3 16:21:13 CDT 2020
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