NAME    [Toc]    [Back]

     umount - unmount file systems

SYNOPSIS    [Toc]    [Back]

     umount [-fv] special | node
     umount -a [-fv] [-h host] [-t ufs | lfs | external_type]

DESCRIPTION    [Toc]    [Back]

     The umount command calls the unmount(2) system call  to  remove a special
     device  or the remote node (rhost:path) from the file system
tree at the
     point node.  If neither special nor node are  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.

     -h host
             Only  filesystems  mounted  from  the specified host
will be unmounted.
  This option implies the -a option  and,  unless
otherwise
             specified  with the -t option, will only unmount NFS
filesystems.

     -t ufs | lfs | external type
             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 ``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.

     -v       Verbose,  additional  information is printed out as
each file system
 is unmounted.

FILES    [Toc]    [Back]

     /etc/fstab  file system table

SEE ALSO    [Toc]    [Back]

     unmount(2), fstab(5), mount(8)

HISTORY    [Toc]    [Back]

     A umount command appeared in Version 3 AT&T UNIX.

OpenBSD     3.6                        February     20,      1994