V4/usr/man/man8/update.8

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.th UPDATE VIII 11/1/73
.sh NAME
update \*- periodically update the super block
.sh SYNOPSIS
.bd update
.sh DESCRIPTION
.it Update
is a program that executes
the
.it sync
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 sync(II) for details.
.sh "SEE ALSO"
sync(II), init(VII)
.sh BUGS
There is a system bug which, it is suspected,
may be aggravated by this program.
Until further notice,
.it update
should not be run.