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. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)umount.8 8.1 (Berkeley) 2/20/94 33.\" 34.Dd February 20, 1994 35.Dt UMOUNT 8 36.Os BSD 4 37.Sh NAME 38.Nm umount 39.Nd unmount file systems 40.Sh SYNOPSIS 41.Nm umount 42.Op Fl fv 43.Ar special | node 44.Nm umount 45.Fl a 46.Op Fl fv 47.Op Fl h Ar host 48.Op Fl t Ar ufs | lfs | external_type 49.Sh DESCRIPTION 50The 51.Nm umount 52command 53calls the 54.Xr unmount 2 55system call to remove a 56.Ar "special device" 57or the remote node (rhost:path) from the file system tree at the point 58.Ar node . 59If either 60.Ar special 61or 62.Ar node 63are not provided, the appropriate information is taken from the 64.Xr fstab 5 65file. 66.Pp 67The options are as follows: 68.Bl -tag -width indent 69.It Fl a 70All of the file systems described in 71.Xr fstab 5 72are unmounted. 73.It Fl f 74The file system is forcibly unmounted. 75Active special devices continue to work, 76but all other files return errors if further accesses are attempted. 77The root file system cannot be forcibly unmounted. 78.It Fl h Ar host 79Only filesystems mounted from the specified host will be 80unmounted. 81This option is implies the 82.Fl a 83option and, unless otherwise specified with the 84.Fl t 85option, will only unmount NFS filesystems. 86.It Fl t Ar "ufs \\*(Ba lfs \\*(Ba external type" 87Is used to indicate the actions should only be taken on 88filesystems of the specified type. 89More than one type may be specified in a comma separated list. 90The list of filesystem types can be prefixed with 91.Dq no 92to specify the filesystem types for which action should 93.Em not 94be taken. 95For example, the 96.Nm umount 97command: 98.Bd -literal -offset indent 99umount -a -t nfs,mfs 100.Ed 101.Pp 102umounts all filesystems of the type 103.Tn NFS 104and 105.Tn MFS . 106.It Fl v 107Verbose, additional information is printed out as each file system 108is unmounted. 109.El 110.Sh FILES 111.Bl -tag -width /etc/fstab -compact 112.It Pa /etc/fstab 113file system table 114.El 115.Sh SEE ALSO 116.Xr unmount 2 , 117.Xr fstab 5 , 118.Xr mount 8 119.Sh HISTORY 120A 121.Nm umount 122command appeared in 123.At v6 . 124