1 .\" Copyright (c) 1980, 1989, 1991, 1993
2 .\" The Regents of the University of California. All rights reserved.
4 .\" Redistribution and use in source and binary forms, with or without
5 .\" modification, are permitted provided that the following conditions
7 .\" 1. Redistributions of source code must retain the above copyright
8 .\" notice, this list of conditions and the following disclaimer.
9 .\" 2. Redistributions in binary form must reproduce the above copyright
10 .\" notice, this list of conditions and the following disclaimer in the
11 .\" documentation and/or other materials provided with the distribution.
12 .\" 3. Neither the name of the University nor the names of its contributors
13 .\" may be used to endorse or promote products derived from this software
14 .\" without specific prior written permission.
16 .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
17 .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
20 .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 .\" @(#)umount.8 8.2 (Berkeley) 5/8/95
29 .\" $FreeBSD: src/sbin/umount/umount.8,v 1.7.2.3 2001/12/14 15:17:57 ru Exp $
31 .Dd September 29, 2016
36 .Nd unmount filesystems
53 system call to remove a
55 or the remote node (rhost:path) from the filesystem tree at the point
61 are not provided, the appropriate information is taken from the
65 The options are as follows:
66 .Bl -tag -width indent
68 All the filesystems described in
72 All the currently mounted filesystems except
73 the root are unmounted.
79 The filesystem is forcibly unmounted.
80 Active special devices continue to work,
81 but all other files return errors if further accesses are attempted.
82 The root filesystem cannot be forcibly unmounted.
84 Only filesystems mounted from the specified host will be
86 This option implies the
88 option and, unless otherwise specified with the
90 option, will only unmount
94 Is used to indicate the actions should only be taken on
95 filesystems of the specified type.
96 More than one type may be specified in a comma separated list.
97 The list of filesystem types can be prefixed with
99 to specify the filesystem types for which action should
105 .Bd -literal -offset indent
109 unmounts all filesystems of the type
113 that are listed in the
117 Verbose, additional information is printed out as each filesystem
121 .Bl -tag -width PATH_FSTAB
123 If the environment variable
125 is set all operations are performed against the specified file.
128 .Bl -tag -width /etc/fstab -compact