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.\" 4. Neither the name of the University nor the names of its contributors 13.\" may be used to endorse or promote products derived from this software 14.\" without specific prior written permission. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 17.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 20.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.\" @(#)umount.8 8.2 (Berkeley) 5/8/95 29.\" $FreeBSD$ 30.\" 31.Dd July 18, 2003 32.Dt UMOUNT 8 33.Os 34.Sh NAME 35.Nm umount 36.Nd unmount file systems 37.Sh SYNOPSIS 38.Nm 39.Op Fl fv 40.Ar special | node | fsid 41.Nm 42.Fl a | A 43.Op Fl F Ar fstab 44.Op Fl fv 45.Op Fl h Ar host 46.Op Fl t Ar type 47.Sh DESCRIPTION 48The 49.Nm 50utility calls the 51.Xr unmount 2 52system call to remove a file system from the file system tree. 53The file system can be specified by its 54.Ar special 55device or remote node (rhost:path), the path to the mount point 56.Ar node 57or by the file system ID 58.Ar fsid 59as reported by 60.Dq mount -v . 61.Pp 62The options are as follows: 63.Bl -tag -width indent 64.It Fl a 65All the file systems described in 66.Xr fstab 5 67are unmounted. 68.It Fl A 69All the currently mounted file systems except 70the root are unmounted. 71.It Fl F Ar fstab 72Specify the 73.Pa fstab 74file to use. 75.It Fl f 76The file system is forcibly unmounted. 77Active special devices continue to work, 78but all other files return errors if further accesses are attempted. 79The root file system cannot be forcibly unmounted. 80.It Fl h Ar host 81Only file systems mounted from the specified host will be 82unmounted. 83This option implies the 84.Fl A 85option and, unless otherwise specified with the 86.Fl t 87option, will only unmount 88.Tn NFS 89file systems. 90.It Fl t Ar type 91Is used to indicate the actions should only be taken on 92file systems of the specified type. 93More than one type may be specified in a comma separated list. 94The list of file system types can be prefixed with 95.Dq no 96to specify the file system 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,nullfs 104.Ed 105.Pp 106unmounts all file systems of the type 107.Tn NFS 108and 109.Tn NULLFS 110that are listed in the 111.Xr fstab 5 112file. 113.It Fl v 114Verbose, additional information is printed out as each file system 115is unmounted. 116.El 117.Sh ENVIRONMENT 118.Bl -tag -width ".Ev PATH_FSTAB" 119.It Ev PATH_FSTAB 120If the environment variable 121.Ev PATH_FSTAB 122is set, all operations are performed against the specified file. 123.Ev PATH_FSTAB 124will not be honored if the process environment or memory address space is 125considered 126.Dq tainted . 127(See 128.Xr issetugid 2 129for more information.) 130.El 131.Sh FILES 132.Bl -tag -width /etc/fstab -compact 133.It Pa /etc/fstab 134file system table 135.El 136.Sh SEE ALSO 137.Xr unmount 2 , 138.Xr fstab 5 , 139.Xr mount 8 140.Sh HISTORY 141A 142.Nm 143utility appeared in 144.At v6 . 145