1.\" $OpenBSD: umount.8,v 1.17 2019/09/06 19:25:08 schwarze Exp $ 2.\" $NetBSD: umount.8,v 1.2 1995/03/18 15:01:35 cgd Exp $ 3.\" 4.\" Copyright (c) 1980, 1989, 1991, 1993 5.\" The Regents of the University of California. All rights reserved. 6.\" 7.\" Redistribution and use in source and binary forms, with or without 8.\" modification, are permitted provided that the following conditions 9.\" are met: 10.\" 1. Redistributions of source code must retain the above copyright 11.\" notice, this list of conditions and the following disclaimer. 12.\" 2. Redistributions in binary form must reproduce the above copyright 13.\" notice, this list of conditions and the following disclaimer in the 14.\" documentation and/or other materials provided with the distribution. 15.\" 3. Neither the name of the University nor the names of its contributors 16.\" may be used to endorse or promote products derived from this software 17.\" without specific prior written permission. 18.\" 19.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29.\" SUCH DAMAGE. 30.\" 31.\" @(#)umount.8 8.1 (Berkeley) 2/20/94 32.\" 33.Dd $Mdocdate: September 6 2019 $ 34.Dt UMOUNT 8 35.Os 36.Sh NAME 37.Nm umount 38.Nd unmount file systems 39.Sh SYNOPSIS 40.Nm umount 41.Op Fl fv 42.Ar special | node 43.Nm umount 44.Fl a 45.Op Fl fv 46.Op Fl h Ar host 47.Op Fl t Ar type 48.Sh DESCRIPTION 49The 50.Nm 51command 52calls the 53.Xr unmount 2 54system call to remove a 55.Ar special 56device or 57.Ar node 58.Pf ( Bo Ar rhost : 59.Bc Ar path ) 60from the file system tree. 61Multiple devices and nodes may be specified on the command line. 62If neither 63.Ar special 64nor 65.Ar node 66are provided, the appropriate information is taken from the kernel. 67.Pp 68The options are as follows: 69.Bl -tag -width Ds 70.It Fl a 71All of the file systems except root returned by 72.Xr getmntinfo 3 73are unmounted. 74.It Fl f 75The file system is forcibly unmounted. 76Active special devices continue to work, 77but all other files return errors if further accesses are attempted. 78The root file system cannot be forcibly unmounted. 79.It Fl h Ar host 80Only filesystems mounted from the specified host will be 81unmounted. 82This option implies the 83.Fl a 84option and, unless otherwise specified with the 85.Fl t 86option, will only unmount NFS filesystems. 87.It Fl t Ar type 88Indicates that actions should only be taken on 89filesystems of the specified type. 90More than one type may be specified in a comma separated list. 91The list of filesystem types can be prefixed with 92.Dq no 93to specify the filesystem types for which action should 94.Em not 95be taken. 96For example, the following command 97unmounts all filesystems of type 98NFS and MFS: 99.Bd -literal -offset indent 100# umount -a -t nfs,mfs 101.Ed 102.It Fl v 103Verbose, additional information is printed out as each file system 104is unmounted. 105.El 106.Sh SEE ALSO 107.Xr unmount 2 , 108.Xr getmntinfo 3 , 109.Xr mount 8 110.Sh HISTORY 111A 112.Nm 113command appeared in 114.At v1 . 115