1.\" $OpenBSD: umount.8,v 1.11 2003/06/02 20:06:17 millert Exp $ 2.\" $NetBSD: umount.8,v 1.2 1995/03/18 15:01:35 cgd Exp $ 3.\" 4.\" Copyright (c) 1980, 1989, 1991, 1993 5.\" The Regents of the University of California. All rights reserved. 6.\" 7.\" Redistribution and use in source and binary forms, with or without 8.\" modification, are permitted provided that the following conditions 9.\" are met: 10.\" 1. Redistributions of source code must retain the above copyright 11.\" notice, this list of conditions and the following disclaimer. 12.\" 2. Redistributions in binary form must reproduce the above copyright 13.\" notice, this list of conditions and the following disclaimer in the 14.\" documentation and/or other materials provided with the distribution. 15.\" 3. Neither the name of the University nor the names of its contributors 16.\" may be used to endorse or promote products derived from this software 17.\" without specific prior written permission. 18.\" 19.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29.\" SUCH DAMAGE. 30.\" 31.\" @(#)umount.8 8.1 (Berkeley) 2/20/94 32.\" 33.Dd February 20, 1994 34.Dt UMOUNT 8 35.Os 36.Sh NAME 37.Nm umount 38.Nd unmount file systems 39.Sh SYNOPSIS 40.Nm umount 41.Op Fl fv 42.Ar special | node 43.Nm umount 44.Fl a 45.Op Fl fv 46.Op Fl h Ar host 47.Op Fl t Ar ufs | lfs | external_type 48.Sh DESCRIPTION 49The 50.Nm 51command 52calls the 53.Xr unmount 2 54system call to remove a 55.Ar special 56device 57or the remote node (rhost:path) from the file system tree at the point 58.Ar node . 59If neither 60.Ar special 61nor 62.Ar node 63are provided, the appropriate information is taken from the 64.Xr fstab 5 65file. 66.Pp 67The options are as follows: 68.Bl -tag -width Ds 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 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 97command: 98.Bd -literal -offset indent 99# umount -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 122command appeared in 123.At v3 . 124