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BSD 2.11 - man page for umount (bsd section 8)

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UMOUNT(8)										UMOUNT(8)

       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-
		 poses only.

       -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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