UPDATE(8)

NAME
update - flush internal filesystem caches to disk frequently

SYNOPSIS
update

DESCRIPTION
The update command no longer exists, but has been incorporated into the kernel where it will flush dirty buffers that have not been touched for thirty seconds or more.

The same effect can be seen by using the sync(8) command, although the in-kernel update process will do this in a staggered manner.

SEE ALSO
sync(2), fsck(8), init(8), sync(8)

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

HISTORY
An update command appeared in AT&T UNIX.

The update command was incorporated into the kernel in OpenBSD 1.2.