docs: Added All OpenBSD Manuals

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+.\"	$OpenBSD: sync.8,v 1.14 2016/08/16 18:51:25 schwarze Exp $
+.\"	$NetBSD: sync.8,v 1.6 1995/03/21 09:11:35 cgd Exp $
+.\"
+.\" 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. 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
+.\"
+.Dd $Mdocdate: August 16 2016 $
+.Dt SYNC 8
+.Os
+.Sh NAME
+.Nm sync
+.Nd force completion of pending disk writes (flush cache)
+.Sh SYNOPSIS
+.Nm sync
+.Sh DESCRIPTION
+The
+.Nm
+utility can be called to ensure 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 8
+or
+.Xr halt 8
+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
+utilizes the
+.Xr sync 2
+function.
+.Sh SEE ALSO
+.Xr fsync 2 ,
+.Xr sync 2 ,
+.Xr halt 8 ,
+.Xr reboot 8
+.Sh HISTORY
+A
+.Nm
+command appeared in
+.At v4 .