BSD 2.11 - man page for umount (bsd section 8)
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umount - unmount file systems
umount [ -fv ] special | node
umount -a [ -fv ] [ -t ufs | external_type ]
The umount command calls the umount(2) system call to remove a special device from the
file system tree at the point node. If either special or node are not provided, the
appropriate information is taken from the fstab(5) file.
The options are as follows:
-a All of the file systems described in fstab(5) are unmounted.
-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
-t ufs | external type
Is used to indicate the actions should only be taken on filesystems of the spec-
ified type. More than one type may be specified in a comma separated list. The
list of filesystem types can be prefixed with no to specify the filesystem types
for which action should not be taken. For example, the umount command:
umount -a -t nfs,mfs
umounts all filesystems of the type NFS and MFS.
NOTE: Only UFS is supported by 2.11BSD. The example is for illustrative pur-
-v Verbose, additional information is printed out as each file system is unmounted.
/etc/fstab file system table
umount(2), fstab(5), mount(8)
A umount command appeared in Version 6 AT&T UNIX.
4.4 Berkeley Distribution January 16, 1996 UMOUNT(8)
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