.\" Copyright (c) 1996 Andries Brouwer .\" This page is somewhat derived from a page that was .\" (c) 1980, 1989, 1991 The Regents of the University of California .\" and had been heavily modified by Rik Faith and myself. .\" .\" This is free documentation; you can redistribute it and/or .\" modify it under the terms of the GNU General Public License as .\" published by the Free Software Foundation; either version 2 of .\" the License, or (at your option) any later version. .\" .\" The GNU General Public License's references to "object code" .\" and "executables" are to be interpreted as the output of any .\" document formatting or typesetting system, including .\" intermediate and printed output. .\" .\" This manual is distributed in the hope that it will be useful, .\" but WITHOUT ANY WARRANTY; without even the implied warranty of .\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the .\" GNU General Public License for more details. .\" .\" You should have received a copy of the GNU General Public .\" License along with this manual; if not, write to the Free .\" Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, .\" USA. .\" .TH UMOUNT 8 "5 July 1996" "Linux 2.0" "Linux Programmer's Manual" .SH NAME umount \- unmount file systems .SH SYNOPSIS .BI "umount [\-hV]" .LP .BI "umount -a [\-nv] [\-t " vfstype ] .br .BI "umount [\-nv] " "device " | " dir " [...] .SH DESCRIPTION The .B umount command detaches the file system(s) mentioned from the file hierarchy. A file system is specified either by giving the directory where it has been mounted, or by giving the special device on which it lives. Note that a file system cannot be unmounted when it is `busy' - for example, when there are open files on it, or when some process has its working directory there, or when a swap file on it is in use. The offending process could even be .B umount itself - it opens libc, and libc in its turn may open for example locale files. Options for the .B umount command: .TP .B \-V Print version and exit. .TP .B \-h Print help message and exit. .TP .B \-v Verbose mode. .TP .B \-n Unmount without writing in .IR /etc/mtab . .TP .B \-a All of the file systems described in .I /etc/mtab are unmounted. .TP .BI \-t " vfstype" Indicate that the actions should only be taken on file systems of the specified type. More than one type may be specified in a comma separated list. The list of file system types can be prefixed with .B no to specify the file system types on which no action should be taken. .SH "THE LOOP DEVICE" The .B umount command will free the loop device (if any) associated with the mount, in case it finds the option `loop=...' in .IR /etc/mtab . Any pending loop devices can be freed using `losetup -d', see .BR losetup (8). .SH FILES .I /etc/mtab table of mounted file systems .SH "SEE ALSO" .BR umount (2), .BR mount (8), .BR losetup (8). .SH HISTORY A .B umount command appeared in Version 6 AT&T UNIX.