update(8) Mac OS X Manual Page

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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 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

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