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.\" $Id$ 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 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 NFS filesystems. 90.It Fl t Ar type 91Is used to indicate the actions should only be taken on 92filesystems of the specified type. 93More than one type may be specified in a comma separated list. 94The list of filesystem types can be prefixed with 95.Dq no 96to specify the filesystem types for which action should 97.Em not 98be taken. 99For example, the 100.Nm 101command: 102.Bd -literal -offset indent 103umount -a -t nfs,mfs 104.Ed 105.Pp 106umounts all filesystems of the type 107.Tn NFS 108and 109.Tn MFS . 110.It Fl v 111Verbose, additional information is printed out as each filesystem 112is unmounted. 113.El 114.Sh FILES 115.Bl -tag -width /etc/fstab -compact 116.It Pa /etc/fstab 117filesystem table 118.El 119.Sh SEE ALSO 120.Xr unmount 2 , 121.Xr fstab 5 , 122.Xr mount 8 123.Sh BUGS 124When using union filesystems, 125.Xr umount 8 126cannot always determine the node which is the mountpoint. 127In this case, 128it is necessary to specify the relevant directory to be unmounted 129in the same form as that displayed by 130.Xr mount 8 . 131For example, given a mount entry like this: 132.Bd -literal -offset indent 133<above>/tmpdir on /cdrom (local, user mount) 134.Ed 135.Pp 136then the command: 137.Bd -literal -offset indent 138umount '<above>/tmpdir' 139.Ed 140.Pp 141would unmount 142.Ar /tmpdir 143from the mountpoint 144.Ar /cdrom . 145.Sh HISTORY 146A 147.Nm 148command appeared in 149.At v6 . 150