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+.\" Copyright (c) 1980, 1989, 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.
+.\"
+.\"     @(#)umount.8	8.2 (Berkeley) 5/8/95
+.\"
+.Dd May 8, 1995
+.Dt UMOUNT 8
+.Os BSD 4
+.Sh NAME
+.Nm umount
+.Nd unmount filesystems
+.Sh SYNOPSIS
+.Nm umount
+.Op Fl fv
+.Ar special | node
+.Nm umount
+.Fl a | A
+.Op Fl fv
+.Op Fl h Ar host
+.Op Fl t Ar type
+.Sh DESCRIPTION
+The
+.Nm umount
+command
+calls the
+.Xr unmount 2
+system call to remove a
+.Ar "special device"
+or the remote node (rhost:path) from the filesystem tree at the point
+.Ar node .
+If either
+.Ar special
+or
+.Ar node
+are not provided, the appropriate information is taken from the
+list of filesystems provided by
+.Xr getfsent 3 .
+.Pp
+The options are as follows:
+.Bl -tag -width indent
+.It Fl a
+All the filesystems described via
+.Xr getfsent 3
+are unmounted.
+.It Fl A
+All the currently mounted filesystems except
+the root are unmounted.
+.It Fl f
+The filesystem is forcibly unmounted.
+Active special devices continue to work,
+but all other files return errors if further accesses are attempted.
+The root filesystem cannot be forcibly unmounted.
+.It Fl h Ar host
+Only filesystems mounted from the specified host will be
+unmounted.
+This option implies the
+.Fl A
+option and, unless otherwise specified with the
+.Fl t
+option, will only unmount NFS filesystems.
+.It Fl t Ar type
+Is used to indicate the actions should only be taken on
+filesystems of the specified type.
+More than one type may be specified in a comma separated list.
+The list of filesystem types can be prefixed with
+.Dq no
+to specify the filesystem types for which action should
+.Em not
+be taken.
+For example, the
+.Nm umount
+command:
+.Bd -literal -offset indent
+umount -A -t nfs,hfs
+.Ed
+.Pp
+umounts all currently-mounted filesystems of the type
+.Tn NFS
+and
+.Tn HFS .
+(The
+.Fl a
+option only unmounts entries in the
+.Pa /etc/fstab
+list.)
+.It Fl v
+Verbose, additional information is printed out as each filesystem
+is unmounted.
+.El
+.Sh NOTES
+Due to the complex and interwoven nature of Mac OS X,
+.Nm umount
+may fail often.  It is recommended that
+.Xr diskutil 1
+(as in, ``diskutil unmount /mnt'') be used instead.
+.Sh SEE ALSO
+.Xr unmount 2 ,
+.Xr getfsent 3 ,
+.Xr mount 8 ,
+.Xr diskutil 1
+.Sh HISTORY
+A
+.Nm umount
+command appeared in
+.At v6 .