The "umount" command unmounts a currently
mounted filesystem, which can be specified either
as a mounted-on directory or a filesystem.
If a mount point is busy, there are a couple
things to try:
On some non-BSD based machines you can use the
command "umount -k" to force the system to drop a
# umount -k /hosts/foo
If you are on a standalone system or none of the
filesystems are being exported, then "cd /" in
all open shells or windows and umount.
NOTE: All tips provided are USE AT YOUR OWN RISK. Tips are submitted
by various unix admins around the globe. UGU suggest you read and
test each tip in a non-volitile environment before placing into