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.\" $NetBSD: sync.8,v 1.12 2001/12/20 20:03:30 wiz Exp $
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1995-03-21 12:01:59 +03:00
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.\"
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1994-09-20 08:18:10 +04:00
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.\" Copyright (c) 1980, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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1993-08-02 21:15:52 +04:00
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.\"
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1994-09-20 08:18:10 +04:00
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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1993-03-21 12:45:37 +03:00
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.\"
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1994-09-20 08:18:10 +04:00
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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1993-03-21 12:45:37 +03:00
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.\"
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1995-03-21 12:01:59 +03:00
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.\" @(#)sync.8 8.1 (Berkeley) 5/31/93
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1994-09-20 08:18:10 +04:00
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.\"
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.Dd May 31, 1993
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.Dt SYNC 8
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1999-03-22 21:25:43 +03:00
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.Os
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.Sh NAME
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.Nm sync
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.Nd force completion of pending disk writes (flush cache)
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.Sh SYNOPSIS
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.Nm sync
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.Sh DESCRIPTION
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2001-12-20 22:31:48 +03:00
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The
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.Nm
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program can be called to ensure that all disk writes have been
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completed before the processor is halted in a way not suitably done by
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.Xr reboot 8
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or
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.Xr halt 8 .
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Generally, it is preferable to use
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.Xr reboot 8
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or
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.Xr halt 8
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to shut down the system,
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as they may perform additional actions
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such as resynchronizing the hardware clock
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and flushing internal caches before performing a final
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.Nm "" .
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.Pp
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The
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.Nm
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program simply invokes the
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.Xr sync 2
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system call.
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.Sh SEE ALSO
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.Xr fsync 2 ,
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.Xr sync 2 ,
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.Xr halt 8 ,
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.Xr reboot 8
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.Sh HISTORY
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A
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.Nm
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command appeared in
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.At v6 .
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