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 F Ar fstab 49.Op Fl fv 50.Op Fl h Ar host 51.Op Fl t Ar type 52.Sh DESCRIPTION 53The 54.Nm 55command 56calls the 57.Xr unmount 2 58system call to remove a 59.Ar "special device" 60or the remote node (rhost:path) from the filesystem tree at the point 61.Ar node . 62If either 63.Ar special 64or 65.Ar node 66are not provided, the appropriate information is taken from the 67.Xr fstab 5 68file. 69.Pp 70The options are as follows: 71.Bl -tag -width indent 72.It Fl a 73All the filesystems described in 74.Xr fstab 5 75are unmounted. 76.It Fl A 77All the currently mounted filesystems except 78the root are unmounted. 79.It Fl F Ar fstab 80Specify the 81.Pa fstab 82file to use. 83.It Fl f 84The filesystem is forcibly unmounted. 85Active special devices continue to work, 86but all other files return errors if further accesses are attempted. 87The root filesystem cannot be forcibly unmounted. 88.It Fl h Ar host 89Only filesystems mounted from the specified host will be 90unmounted. 91This option implies the 92.Fl A 93option and, unless otherwise specified with the 94.Fl t 95option, will only unmount 96.Tn NFS 97filesystems. 98.It Fl t Ar type 99Is used to indicate the actions should only be taken on 100filesystems of the specified type. 101More than one type may be specified in a comma separated list. 102The list of filesystem types can be prefixed with 103.Dq no 104to specify the filesystem types for which action should 105.Em not 106be taken. 107For example, the 108.Nm 109command: 110.Bd -literal -offset indent 111umount -a -t nfs,mfs 112.Ed 113.Pp 114unmounts all filesystems of the type 115.Tn NFS 116and 117.Tn MFS 118that are listed in the 119.Xr fstab 5 120file. 121.It Fl v 122Verbose, additional information is printed out as each filesystem 123is unmounted. 124.El 125.Sh ENVIRONMENT 126.Bl -tag -width PATH_FSTAB 127.It Pa PATH_FSTAB 128If the environment variable 129.Pa PATH_FSTAB 130is set all operations are performed against the specified file. 131.El 132.Sh FILES 133.Bl -tag -width /etc/fstab -compact 134.It Pa /etc/fstab 135filesystem table 136.El 137.Sh SEE ALSO 138.Xr unmount 2 , 139.Xr fstab 5 , 140.Xr mount 8 141.Sh HISTORY 142A 143.Nm 144command appeared in 145.At v6 . 146