05-09-2001
UNIX can use many kinds of filesystems. When a disk partition is mounted, the type of filesystem is specified in the mount command. Types range from specialized filesystem to network filesystems.
You might try looking at the types of filesystems supported by the <B>mount</B> command on your platform. Also, your kernel configuration files will have details on filesystems supported by your UNIX kernel. Many specialized file systems must be compiled into the kernel, so even if the filesystem is supported, it may not be configured or compiled (and will not work).
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LEARN ABOUT OPENDARWIN
umount
UMOUNT(8) BSD System Manager's Manual UMOUNT(8)
NAME
umount -- unmount filesystems
SYNOPSIS
umount [-fv] special | node
umount -a | -A [-fv] [-h host] [-t type]
DESCRIPTION
The umount command calls the unmount(2) system call to remove a special device or the remote node (rhost:path) from the filesystem 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 the filesystems described in fstab(5) are unmounted.
-A All the currently mounted filesystems except the root are unmounted.
-f The filesystem is forcibly unmounted. Active special devices continue to work, but all other files return errors if further accesses
are attempted. The root filesystem cannot be forcibly unmounted.
-h host
Only filesystems mounted from the specified host will be unmounted. This option is implies the -A option and, unless otherwise spec-
ified with the -t option, will only unmount NFS filesystems.
-t 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,hfs
umounts all filesystems of the type NFS and HFS.
-v Verbose, additional information is printed out as each filesystem is unmounted.
FILES
/etc/fstab filesystem table
SEE ALSO
unmount(2), fstab(5), mount(8)
HISTORY
A umount command appeared in Version 6 AT&T UNIX.
4th Berkeley Distribution May 8, 1995 4th Berkeley Distribution