Use this command to unmount a group of file systems. The -k option runs the fuser -k mount-point command to kill any processes that are associated with the mount-point. The -s option indicates that unmount is not to be performed in parallel. -l specifies that only local file systems are to be used, and -r specifies that only remote file systems are to be used. The -h host option indicates that all file systems from the named host should be unmounted. You cannot combine the -h option with -l or -r.
The following is an example of unmounting all file systems that are mounted from remote hosts:
# umountall -r |
The following is an example of unmounting all file systems that are currently mounted from the server bee:
# umountall -h bee |