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5974081cea
/sbin/umount does not return the correct exit status due to incorrect logic in its internals. Further, because of the nature of the code, you *cannot* use it to umount a directory from a union mountpoint. Well, you can sometimes, it depends on if the directory is at the top of the union stack or not :) Submitted by: njw@cs.city.ac.uk (Nick Williams)
146 lines
4.2 KiB
Groff
146 lines
4.2 KiB
Groff
.\" Copyright (c) 1980, 1989, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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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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.\"
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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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.\"
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.\" @(#)umount.8 8.1 (Berkeley) 2/20/94
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.\"
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.Dd February 20, 1994
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.Dt UMOUNT 8
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.Os BSD 4
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.Sh NAME
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.Nm umount
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.Nd unmount file systems
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.Sh SYNOPSIS
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.Nm umount
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.Op Fl fv
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.Ar special | node
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.Nm umount
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.Fl a
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.Op Fl fv
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.Op Fl h Ar host
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.Op Fl t Ar ufs | lfs | external_type
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.Sh DESCRIPTION
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The
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.Nm umount
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command
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calls the
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.Xr unmount 2
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system call to remove a
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.Ar "special device"
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or the remote node (rhost:path) from the file system tree at the point
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.Ar node .
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If either
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.Ar special
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or
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.Ar node
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are not provided, the appropriate information is taken from the
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.Xr fstab 5
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file.
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.Pp
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The options are as follows:
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.Bl -tag -width indent
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.It Fl a
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All of the file systems described in
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.Xr fstab 5
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are unmounted.
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.It Fl f
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The file system is forcibly unmounted.
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Active special devices continue to work,
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but all other files return errors if further accesses are attempted.
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The root file system cannot be forcibly unmounted.
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.It Fl h Ar host
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Only filesystems mounted from the specified host will be
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unmounted.
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This option is implies the
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.Fl a
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option and, unless otherwise specified with the
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.Fl t
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option, will only unmount NFS filesystems.
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.It Fl t Ar "ufs \\*(Ba lfs \\*(Ba external type"
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Is used to indicate the actions should only be taken on
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filesystems of the specified type.
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More than one type may be specified in a comma separated list.
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The list of filesystem types can be prefixed with
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.Dq no
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to specify the filesystem types for which action should
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.Em not
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be taken.
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For example, the
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.Nm umount
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command:
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.Bd -literal -offset indent
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umount -a -t nfs,mfs
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.Ed
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.Pp
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umounts all filesystems of the type
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.Tn NFS
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and
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.Tn MFS .
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.It Fl v
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Verbose, additional information is printed out as each file system
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is unmounted.
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.El
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.Sh FILES
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.Bl -tag -width /etc/fstab -compact
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.It Pa /etc/fstab
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file system table
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.El
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.Sh SEE ALSO
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.Xr unmount 2 ,
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.Xr fstab 5 ,
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.Xr mount 8
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.Sh BUGS
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When using union filesystems,
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.Xr umount 8
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cannot always determine the node which is the mountpoint.
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In this case,
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it is necessary to specify the relevant directory to be unmounted
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in the same form as that displayed by
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.Xr mount 8 .
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For example, given a mount entry like this:
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.Bd -literal -offset indent
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<above>/tmpdir on /cdrom (local, user mount)
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.Ed
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.Pp
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then the command:
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.Bd -literal -offset indent
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umount '<above>/tmpdir'
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.Ed
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.Pp
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would unmount
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.Ar /tmpdir
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from the mountpoint
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.Ar /cdrom .
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.Sh HISTORY
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A
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.Nm umount
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command appeared in
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.At v6 .
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