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: src/sbin/umount/umount.8,v 1.7.2.3 2001/12/14 15:17:57 ru Exp $ 34.\" $DragonFly: src/sbin/umount/umount.8,v 1.2 2003/06/17 04:27:34 dillon Exp $ 35.\" 36.Dd May 8, 1995 37.Dt UMOUNT 8 38.Os 39.Sh NAME 40.Nm umount 41.Nd unmount filesystems 42.Sh SYNOPSIS 43.Nm 44.Op Fl fv 45.Ar special \&| node 46.Nm 47.Fl a | A 48.Op Fl fv 49.Op Fl h Ar host 50.Op Fl t Ar type 51.Sh DESCRIPTION 52The 53.Nm 54command 55calls the 56.Xr unmount 2 57system call to remove a 58.Ar "special device" 59or the remote node (rhost:path) from the filesystem tree at the point 60.Ar node . 61If either 62.Ar special 63or 64.Ar node 65are not provided, the appropriate information is taken from the 66.Xr fstab 5 67file. 68.Pp 69The options are as follows: 70.Bl -tag -width indent 71.It Fl a 72All the filesystems described in 73.Xr fstab 5 74are unmounted. 75.It Fl A 76All the currently mounted filesystems except 77the root are unmounted. 78.It Fl f 79The filesystem is forcibly unmounted. 80Active special devices continue to work, 81but all other files return errors if further accesses are attempted. 82The root filesystem cannot be forcibly unmounted. 83.It Fl h Ar host 84Only filesystems mounted from the specified host will be 85unmounted. 86This option implies the 87.Fl A 88option and, unless otherwise specified with the 89.Fl t 90option, will only unmount 91.Tn NFS 92filesystems. 93.It Fl t Ar type 94Is used to indicate the actions should only be taken on 95filesystems of the specified type. 96More than one type may be specified in a comma separated list. 97The list of filesystem types can be prefixed with 98.Dq no 99to specify the filesystem types for which action should 100.Em not 101be taken. 102For example, the 103.Nm 104command: 105.Bd -literal -offset indent 106umount -a -t nfs,mfs 107.Ed 108.Pp 109unmounts all filesystems of the type 110.Tn NFS 111and 112.Tn MFS 113that are listed in the 114.Xr fstab 5 115file. 116.It Fl v 117Verbose, additional information is printed out as each filesystem 118is unmounted. 119.El 120.Sh FILES 121.Bl -tag -width /etc/fstab -compact 122.It Pa /etc/fstab 123filesystem table 124.El 125.Sh SEE ALSO 126.Xr unmount 2 , 127.Xr fstab 5 , 128.Xr mount 8 129.Sh HISTORY 130A 131.Nm 132command appeared in 133.At v6 . 134