umount

Unlink a filesystem from its mount point, making it no longer accessible.

A filesystem cannot be unmounted when it is busy.

• Unmount a filesystem, by passing the path to the source it is mounted from:

umount {path/to/device_file}

• Unmount a filesystem, by passing the path to the target where it is mounted:

umount {path/to/mounted_directory}

• Unmount all mounted filesystems (except the `proc` filesystem):

umount -a

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