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UMOUNT(8)			    Linux Programmer's Manual				UMOUNT(8)

       umount - unmount file systems

       umount [-hV]

       umount -a [-dflnrv] [-t vfstype] [-O options]
       umount [-dflnrv] dir | device [...]

       The  umount command detaches the file system(s) mentioned from the file hierarchy.  A file
       system is specified by giving the directory where it has been mounted. Giving the  special
       device  on  which  the file system lives may also work, but is obsolete, mainly because it
       will fail in case this device was mounted on more than one directory.

       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 umount itself - it opens  libc,
       and  libc in its turn may open for example locale files.  A lazy unmount avoids this prob-

       Options for the umount command:

       -V     Print version and exit.

       -h     Print help message and exit.

       -v     Verbose mode.

       -n     Unmount without writing in /etc/mtab.

       -r     In case unmounting fails, try to remount read-only.

       -d     In case the unmounted device was a loop device, also free this loop device.

       -a     All of the file systems described in /etc/mtab are unmounted. (With umount  version
	      2.7 and later: the proc filesystem is not unmounted.)

       -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 no to specify the file system types on which
	      no action should be taken.

       -O options
	      Indicate that the actions should only be taken on file systems with  the	specified
	      options in /etc/fstab.  More than one option type may be specified in a comma sepa-
	      rated list.  Each option can be prefixed with no to specify options  for	which  no
	      action should be taken.

       -f     Force  unmount (in case of an unreachable NFS system).  (Requires kernel 2.1.116 or

       -l     Lazy unmount. Detach the filesystem from the filesystem hierarchy now, and  cleanup
	      all references to the filesystem as soon as it is not busy anymore.  (Requires ker-
	      nel 2.4.11 or later.)

       The umount command will free the loop device (if any) associated with the mount,  in  case
       it finds the option `loop=...' in /etc/mtab, or when the -d option was given.  Any pending
       loop devices can be freed using `losetup -d', see losetup(8).

       /etc/mtab table of mounted file systems

       umount(2), mount(8), losetup(8).

       A umount command appeared in Version 6 AT&T UNIX.

Linux 2.0				   26 July 1997 				UMOUNT(8)
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