1994-05-26 08:18:55 +02:00
|
|
|
.\" Copyright (c) 1980, 1991, 1993
|
|
|
|
|
.\" The Regents of the University of California. 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 the University of
|
|
|
|
|
.\" California, Berkeley and its contributors.
|
|
|
|
|
.\" 4. Neither the name of the University nor the names of its contributors
|
|
|
|
|
.\" may be used to endorse or promote products derived from this software
|
|
|
|
|
.\" without specific prior written permission.
|
|
|
|
|
.\"
|
|
|
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
|
|
|
|
|
.\"
|
|
|
|
|
.\" @(#)sync.8 8.1 (Berkeley) 5/31/93
|
1996-02-12 01:45:47 +01:00
|
|
|
.\" $Id: sync.8,v 1.2 1994/09/24 02:59:08 davidg Exp $
|
1994-05-26 08:18:55 +02:00
|
|
|
.\"
|
|
|
|
|
.Dd May 31, 1993
|
|
|
|
|
.Dt SYNC 8
|
|
|
|
|
.Os BSD 4
|
|
|
|
|
.Sh NAME
|
|
|
|
|
.Nm sync
|
|
|
|
|
.Nd force completion of pending disk writes (flush cache)
|
|
|
|
|
.Sh SYNOPSIS
|
|
|
|
|
.Nm sync
|
|
|
|
|
.Sh DESCRIPTION
|
|
|
|
|
.Nm Sync
|
|
|
|
|
can be called to insure that all disk writes have been completed before the
|
|
|
|
|
processor is halted in a way not suitably done by
|
|
|
|
|
.Xr reboot 8
|
|
|
|
|
or
|
|
|
|
|
.Xr halt 8 .
|
|
|
|
|
Generally, it is preferable to use
|
|
|
|
|
.Xr reboot
|
|
|
|
|
or
|
|
|
|
|
.Xr halt
|
|
|
|
|
to shut down the system,
|
|
|
|
|
as they may perform additional actions
|
|
|
|
|
such as resynchronizing the hardware clock
|
|
|
|
|
and flushing internal caches before performing a final
|
|
|
|
|
.Nm sync .
|
|
|
|
|
.Pp
|
|
|
|
|
.Nm Sync
|
|
|
|
|
utilizes the
|
|
|
|
|
.Xr sync 2
|
|
|
|
|
function call.
|
|
|
|
|
.Sh SEE ALSO
|
|
|
|
|
.Xr sync 2 ,
|
|
|
|
|
.Xr fsync 2 ,
|
1996-02-12 01:45:47 +01:00
|
|
|
.Xr update 4 ,
|
1994-05-26 08:18:55 +02:00
|
|
|
.Xr halt 8 ,
|
1996-02-12 01:45:47 +01:00
|
|
|
.Xr reboot 8
|
1994-05-26 08:18:55 +02:00
|
|
|
.Sh HISTORY
|
|
|
|
|
A
|
|
|
|
|
.Nm sync
|
|
|
|
|
command appeared in
|
|
|
|
|
.At v6 .
|
