umount

Unlink a filesystem from its mount point, making it no longer accessible. A filesystem cannot be unmounted when it is busy. More information: https://man.openbsd.org/umount.

• 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