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OpenDarwin 7.2.1 - man page for update (opendarwin section 8)

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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 command helps protect the integrity of disk volumes by flushing volatile cached
     filesystem data to disk at thirty second intervals.  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
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