1.\" Copyright (c) 1980, 1989, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 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. 15.\" 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 26.\" SUCH DAMAGE. 27.\" 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 $ 30.\" $DragonFly: src/sbin/umount/umount.8,v 1.2 2003/06/17 04:27:34 dillon Exp $ 31.\" 32.Dd May 8, 1995 33.Dt UMOUNT 8 34.Os 35.Sh NAME 36.Nm umount 37.Nd unmount filesystems 38.Sh SYNOPSIS 39.Nm 40.Op Fl fv 41.Ar special \&| node 42.Nm 43.Fl a | A 44.Op Fl F Ar fstab 45.Op Fl fv 46.Op Fl h Ar host 47.Op Fl t Ar type 48.Sh DESCRIPTION 49The 50.Nm 51command 52calls the 53.Xr unmount 2 54system call to remove a 55.Ar "special device" 56or the remote node (rhost:path) from the filesystem tree at the point 57.Ar node . 58If either 59.Ar special 60or 61.Ar node 62are not provided, the appropriate information is taken from the 63.Xr fstab 5 64file. 65.Pp 66The options are as follows: 67.Bl -tag -width indent 68.It Fl a 69All the filesystems described in 70.Xr fstab 5 71are unmounted. 72.It Fl A 73All the currently mounted filesystems except 74the root are unmounted. 75.It Fl F Ar fstab 76Specify the 77.Pa fstab 78file to use. 79.It Fl f 80The filesystem is forcibly unmounted. 81Active special devices continue to work, 82but all other files return errors if further accesses are attempted. 83The root filesystem cannot be forcibly unmounted. 84.It Fl h Ar host 85Only filesystems mounted from the specified host will be 86unmounted. 87This option implies the 88.Fl A 89option and, unless otherwise specified with the 90.Fl t 91option, will only unmount 92.Tn NFS 93filesystems. 94.It Fl t Ar type 95Is used to indicate the actions should only be taken on 96filesystems of the specified type. 97More than one type may be specified in a comma separated list. 98The list of filesystem types can be prefixed with 99.Dq no 100to specify the filesystem types for which action should 101.Em not 102be taken. 103For example, the 104.Nm 105command: 106.Bd -literal -offset indent 107umount -a -t nfs,mfs 108.Ed 109.Pp 110unmounts all filesystems of the type 111.Tn NFS 112and 113.Tn MFS 114that are listed in the 115.Xr fstab 5 116file. 117.It Fl v 118Verbose, additional information is printed out as each filesystem 119is unmounted. 120.El 121.Sh ENVIRONMENT 122.Bl -tag -width PATH_FSTAB 123.It Pa PATH_FSTAB 124If the environment variable 125.Pa PATH_FSTAB 126is set all operations are performed against the specified file. 127.El 128.Sh FILES 129.Bl -tag -width /etc/fstab -compact 130.It Pa /etc/fstab 131filesystem table 132.El 133.Sh SEE ALSO 134.Xr unmount 2 , 135.Xr fstab 5 , 136.Xr mount 8 137.Sh HISTORY 138A 139.Nm 140command appeared in 141.At v6 . 142