Sun Microsystems Sun Workstation 100U System Manager's Manual page 264

UPDATE (8) MAINTENANCE COMMANDS
UPDATE(8)
NAME
update - periodically update the super block
SYNOPSIS
Jete/update
DESCRIPTION
Update is a program that executes the
Bync(2) primitive every 30 seconds. This insures that the
file system
is
fairly up to date in case of a crash. This command should not
be
executed directly,
but should be executed out of the initialization shell command file.
SEE ALSO
sync(2), sync(8), init(8)
SUD
Release 1.1
Last change: 13 June 1983
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