4.4BSD/usr/share/man/cat8/update.0

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

NNAAMMEE
     uuppddaattee - flush internal filesystem caches to disk frequently

SSYYNNOOPPSSIISS
     uuppddaattee

DDEESSCCRRIIPPTTIIOONN
     The uuppddaattee command helps protect the integrity of disk volumes by flush-
     ing voliatile cached filesystem data to disk at thirty second intervals.
     UUppddaattee uses the sync(2) function call to do the task.

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

SSEEEE AALLSSOO
     sync(2),  fsck(8),  init(8),  rc(8),  sync(8)

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

HHIISSTTOORRYY
     An uuppddaattee command appeared in Version 6 AT&T UNIX.

4.4BSD                           June 6, 1993                                1