.\" .\" Copyright (c) 1996 SigmaSoft, Th. Lockert .\" All rights reserved. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in the .\" documentation and/or other materials provided with the distribution. .\" 3. All advertising materials mentioning features or use of this software .\" must display the following acknowledgement: .\" This product includes software developed by SigmaSoft, Th. Lockert. .\" 4. The name of the author may not be used to endorse or promote products .\" derived from this software without specific prior written permission .\" .\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR .\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES .\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. .\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, .\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT .\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, .\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY .\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT .\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF .\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. .\" .\" $OpenBSD: update.8,v 1.4 1996/07/13 22:45:25 millert Exp $ .\" .Dd June 8, 1996 .Dt UPDATE 8 .Os .Sh NAME .Nm update .Nd flush internal filesystem caches to disk frequently .Sh SYNOPSIS .Nm update .Sh DESCRIPTION The .Nm 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. .Pp The same effect can be seen by using the .Xr sync 8 command, although the in-kernel .Nm update process will do this in a staggered manner. .Sh SEE ALSO .Xr sync 2 , .Xr fsck 8 , .Xr init 8 , .Xr sync 8 .Sh BUGS It is possible on some systems, that a .Xr sync occuring simultaneously with a crash may cause file system damage. See .Xr fsck 8 . .Sh HISTORY An .Nm update command appeared in .At v6 . .Pp The .Nm update command was incorporated into the kernel in .Ox 1.2 .