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+.\" Copyright (c) 1980, 1991 Regents of the University of California.
+.\" All rights reserved.
+.\"
+.\" %sccs.include.redist.roff%
+.\"
+.\"	%W% (Berkeley) %G%
+.\"
+.Dd %Q%
+.Dt SYNC 8
+.Os BSD 4
+.Sh NAME
+.Nm sync
+.Nd synchronize internal filesystem information with that on the disk
+.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 ,
+.Xr halt 8 ,
+.Xr reboot 8 ,
+.Xr update 8
+.Sh HISTORY
+A
+.Nm sync
+command appeared in
+.At v6 .