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update(8)                 BSD System Manager's Manual                update(8)


NAME

     update -- flush internal filesystem caches to disk frequently


SYNOPSIS

     update


DESCRIPTION

     The update utility has been incorporated into launchd(8).  It histori-
     cally helped protect the integrity of disk volumes by flushing volatile
     cached filesystem data to disk at thirty second intervals using the
     sync(2) function call.


SEE ALSO

     sync(2), fsck(8), launchd(8), sync(8)


BUGS

     It is possible on some systems that a sync occurring simultaneously with
     a crash may cause file system damage. See fsck(8).


HISTORY

     An update utility appeared in Version 6 AT&T UNIX.

BSD                             August 18, 2008                            BSD

Mac OS X 10.6 - Generated Thu Sep 17 20:26:29 CDT 2009
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