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 July 18, 2003 36.Dt UMOUNT 8 37.Os 38.Sh NAME 39.Nm umount 40.Nd unmount file systems 41.Sh SYNOPSIS 42.Nm 43.Op Fl fv 44.Ar special | node | fsid 45.Nm 46.Fl a | A 47.Op Fl F Ar fstab 48.Op Fl fv 49.Op Fl h Ar host 50.Op Fl t Ar type 51.Sh DESCRIPTION 52The 53.Nm 54utility calls the 55.Xr unmount 2 56system call to remove a file system from the file system tree. 57The file system can be specified by its 58.Ar special 59device or remote node (rhost:path), the path to the mount point 60.Ar node 61or by the file system ID 62.Ar fsid 63as reported by 64.Dq mount -v . 65.Pp 66The options are as follows: 67.Bl -tag -width indent 68.It Fl a 69All the file systems described in 70.Xr fstab 5 71are unmounted. 72.It Fl A 73All the currently mounted file systems except 74the root are unmounted. 75.It Fl F Ar fstab 76Specify the 77.Pa fstab 78file to use. 79.It Fl f 80The file system is forcibly unmounted. 81Active special devices continue to work, 82but all other files return errors if further accesses are attempted. 83The root file system cannot be forcibly unmounted. 84.It Fl h Ar host 85Only file systems mounted from the specified host will be 86unmounted. 87This option implies the 88.Fl A 89option and, unless otherwise specified with the 90.Fl t 91option, will only unmount 92.Tn NFS 93file systems. 94.It Fl t Ar type 95Is used to indicate the actions should only be taken on 96file systems of the specified type. 97More than one type may be specified in a comma separated list. 98The list of file system types can be prefixed with 99.Dq no 100to specify the file system types for which action should 101.Em not 102be taken. 103For example, the 104.Nm 105command: 106.Bd -literal -offset indent 107umount -a -t nfs,nullfs 108.Ed 109.Pp 110unmounts all file systems of the type 111.Tn NFS 112and 113.Tn NULLFS 114that are listed in the 115.Xr fstab 5 116file. 117.It Fl v 118Verbose, additional information is printed out as each file system 119is unmounted. 120.El 121.Sh ENVIRONMENT 122.Bl -tag -width ".Ev PATH_FSTAB" 123.It Ev PATH_FSTAB 124If the environment variable 125.Ev PATH_FSTAB 126is set, all operations are performed against the specified file. 127.Ev PATH_FSTAB 128will not be honored if the process environment or memory address space is 129considred 130.Dq tainted . 131(See 132.Xr issetugid 2 133for more information.) 134.El 135.Sh FILES 136.Bl -tag -width /etc/fstab -compact 137.It Pa /etc/fstab 138file system table 139.El 140.Sh SEE ALSO 141.Xr unmount 2 , 142.Xr fstab 5 , 143.Xr mount 8 144.Sh HISTORY 145A 146.Nm 147utility appeared in 148.At v6 . 149