2.11BSD/src/sbin/umount/umount.8

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.\"     @(#)umount.8	8.1.1 (2.11BSD) 1996/1/16
.\"
.TH UMOUNT 8 "January 16, 1996"
.UC 7
.SH NAME
\fBumount\fP \- unmount file systems
.SH SYNOPSIS
.B umount
[ \fB\-fv\fP ]
\fIspecial\fP | \fInode\fP
.br
.B umount \-a
[ \fB\-fv\fP ]
[ \fB\-t\fP \fIufs\fP | \fIexternal_type\fP ]
.SH DESCRIPTION
The
.B umount
command
calls the
umount(2)
system call to remove a
.I "special device"
from the file system tree at the point
.IR node .
If either
.I special
or
.I node
are not provided, the appropriate information is taken from the
fstab(5)
file.
.PP
The options are as follows:
.sp
.TP 10
.B \-a
All of the file systems described in
fstab(5)
are unmounted.
.TP 10
.B \-f
The file system is forcibly unmounted.
Active special devices continue to work,
but all other files return errors if further accesses are attempted.
The root file system cannot be forcibly unmounted.
This is not currently implemented in 2.11BSD.
.TP 10
\fB\-t\fP \fIufs\fP | \fIexternal type\fP
Is used to indicate the actions should only be taken on
filesystems of the specified type.
More than one type may be specified in a comma separated list.
The list of filesystem types can be prefixed with
.B no
to specify the filesystem types for which action should
.B not
be taken.
For example, the
.B umount
command:
.sp
umount -a -t nfs,mfs
.sp
umounts all filesystems of the type
NFS and MFS.
.sp
\fBNOTE\fP: Only UFS is supported by 2.11BSD.  The example is for illustrative
purposes only.
.TP 10
.B \-v
Verbose, additional information is printed out as each file system
is unmounted.
.SH FILES
.TP 15
/etc/fstab
file system table
.SH SEE ALSO
umount(2),
fstab(5),
mount(8)
.SH HISTORY
A
.B umount
command appeared in
Version 6 AT&T UNIX.