opendarwin man page for update

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

NAME
     update -- flush internal filesystem caches to disk frequently

SYNOPSIS
     update

DESCRIPTION
     The update command helps protect the integrity of disk volumes by flushing volatile cached filesystem data to disk at thirty second inter-
     vals.  Update uses the sync(2) function call to do the task.

     Update is commonly invoked at startup time by rc(8) when the system goes multi-user.

SEE ALSO
     sync(2), fsck(8), init(8), rc(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 command appeared in Version 6 AT&T UNIX.

BSD
								  April 19, 1994							       BSD