update(8) osx man page | unix.com

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 historically 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