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sha1sum(1)                       User Commands                      sha1sum(1)




NAME

       sha1sum - compute and check SHA1 message digest


SYNOPSIS

       sha1sum [OPTION]... [FILE]...


DESCRIPTION

       Print or check SHA1 (160-bit) checksums.

       With no FILE, or when FILE is -, read standard input.

       -b, --binary
              read in binary mode

       -c, --check
              read SHA1 sums from the FILEs and check them

       --tag  create a BSD-style checksum

       -t, --text
              read in text mode (default)

   The following five options are useful only when verifying checksums:
       --ignore-missing
              don't fail or report status for missing files

       --quiet
              don't print OK for each successfully verified file

       --status
              don't output anything, status code shows success

       --strict
              exit non-zero for improperly formatted checksum lines

       -w, --warn
              warn about improperly formatted checksum lines

       --help display this help and exit

       --version
              output version information and exit

       The  sums  are computed as described in FIPS-180-1.  When checking, the
       input should be a former output of this program.  The default  mode  is
       to  print  a  line with checksum, a space, a character indicating input
       mode ('*' for binary, ' ' for text or where binary  is  insignificant),
       and name for each FILE.


BUGS

       Do not use the SHA-1 algorithm for security related purposes.  Instead,
       use an SHA-2  algorithm,  implemented  in  the  programs  sha224sum(1),
       sha256sum(1),  sha384sum(1),  sha512sum(1),  or  the  BLAKE2 algorithm,
       implemented in b2sum(1)


AUTHOR

       Written by Ulrich Drepper, Scott Miller, and David Madore.


REPORTING BUGS

       GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
       Report   sha1sum   translation    bugs    to    <http://translationpro-
       ject.org/team/>


COPYRIGHT

       Copyright  (C) 2017 Free Software Foundation, Inc.  License GPLv3+: GNU
       GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free  to  change  and  redistribute  it.
       There is NO WARRANTY, to the extent permitted by law.


SEE ALSO

       Full documentation at: <http://www.gnu.org/software/coreutils/sha1sum>
       or available locally via: info '(coreutils) sha1sum invocation'



GNU coreutils 8.27                March 2017                        sha1sum(1)

coreutils 8.27 - Generated Fri Mar 10 08:07:28 CST 2017
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