umount linux command

umount

umount [options] [special-device/directory]

System administration command. Unmount a filesystem. umount announces to the system that the removable file structure previously mounted on device special-device is to be removed. umount also works by specifying the directory. Any pending I/O for the filesystem is completed, and the file structure is flagged as clean.

Options

-a

Unmount all filesystems that are listed in /etc/mtab.

-n

Unmount, but do not record changes in /etc/mtab.

-t type

Unmount only filesystems of type type.