unmount –   Unmount a device -a mount all in /etc/tstab -f forces unmount -r if filesystem can’t be unmounted, remount in read-only mode -t mounts specified file type you must specify device or mountpoint umount [-hV] umount -a [-dflnrv] [-t vfstype] [-O options] umount [-dflnrv] dir | device […]   1. Unmount more than  Full Article…