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 8.2 (Berkeley) 5/8/95 33.\" $FreeBSD$ 34.\" 35.Dd May 8, 1995 36.Dt UMOUNT 8 37.Os BSD 4 38.Sh NAME 39.Nm umount 40.Nd unmount filesystems 41.Sh SYNOPSIS 42.Nm umount 43.Op Fl fv 44.Ar special \&| node 45.Nm umount 46.Fl a | A 47.Op Fl fv 48.Op Fl h Ar host 49.Op Fl t Ar type 50.Sh DESCRIPTION 51The 52.Nm 53command 54calls the 55.Xr unmount 2 56system call to remove a 57.Ar "special device" 58or the remote node (rhost:path) from the filesystem tree at the point 59.Ar node . 60If either 61.Ar special 62or 63.Ar node 64are not provided, the appropriate information is taken from the 65.Xr fstab 5 66file. 67.Pp 68The options are as follows: 69.Bl -tag -width indent 70.It Fl a 71All the filesystems described in 72.Xr fstab 5 73are unmounted. 74.It Fl A 75All the currently mounted filesystems except 76the root are unmounted. 77.It Fl f 78The filesystem is forcibly unmounted. 79Active special devices continue to work, 80but all other files return errors if further accesses are attempted. 81The root filesystem cannot be forcibly unmounted. 82.It Fl h Ar host 83Only filesystems mounted from the specified host will be 84unmounted. 85This option implies the 86.Fl A 87option and, unless otherwise specified with the 88.Fl t 89option, will only unmount 90.Tn NFS 91filesystems. 92.It Fl t Ar type 93Is used to indicate the actions should only be taken on 94filesystems of the specified type. 95More than one type may be specified in a comma separated list. 96The list of filesystem types can be prefixed with 97.Dq no 98to specify the filesystem types for which action should 99.Em not 100be taken. 101For example, the 102.Nm 103command: 104.Bd -literal -offset indent 105umount -a -t nfs,mfs 106.Ed 107.Pp 108umounts all filesystems of the type 109.Tn NFS 110and 111.Tn MFS . 112.It Fl v 113Verbose, additional information is printed out as each filesystem 114is unmounted. 115.El 116.Sh FILES 117.Bl -tag -width /etc/fstab -compact 118.It Pa /etc/fstab 119filesystem table 120.El 121.Sh SEE ALSO 122.Xr unmount 2 , 123.Xr fstab 5 , 124.Xr mount 8 125.Sh HISTORY 126A 127.Nm 128command appeared in 129.At v6 . 130