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    Command:

    umount

    
    
    

    SYNOPSIS

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

    DESCRIPTION

           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           lives may also work, but is obsolete, mainly because it  will  fail  in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 problem.
    
           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.
    
           -i     Don't  call  the  /sbin/umount.<filesystem>  helper  even  if it
                  exists. By default /sbin/umount.<filesystem> helper is called if
                  one exists.
    
           -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 pre-
                  fixed 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
                  the mount(8) man page.
    
           --fake Causes  everything to be done except for the actual system call;
                  this ''fakes'' unmounting the filesystem.  It can   be  used  to
                  remove  entries  from /etc/mtab that were unmounted earlier with
                  the -n option.
    
    
    

    THE LOOP DEVICE

           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).
    
    
    

    NOTES

           The syntax of external umount helpers is:
    
           /sbin/umount.<suffix> {dir|device} [-nlfvr] [-t type.subtype]
    
           where  the  <suffix> is filesystem type or a value from "uhelper=" mtab
           option.  The -t option is used  for filesystems with  subtypes  support
           (for example /sbin/mount.fuse -t fuse.sshfs).
    
           The  uhelper (unprivileged umount helper) is possible to used when non-
           root user wants to umount a mountpoint which  is  not  defined  in  the
           /etc/fstab file (e.g devices mounted by HAL).
    
    
    

    FILES

           /etc/mtab table of mounted file systems
    
    
    

    SEE ALSO

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

    HISTORY

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

    AVAILABILITY

           The  umount  command is part of the util-linux-ng package and is avail-
           able from ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.
    
    
    

    Linux 2.0 26 July 1997 UMOUNT(8)

    
    
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