tldr/pages/linux/umount.md

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://manned.org/umount.8.

• 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}}

• When an unmount fails, try to remount the filesystem read-only:

umount {{[-r|--read-only]}} {{path/to/mounted_directory}}

• Recursively unmount each specified directory:

umount {{[-R|--recursive]}} {{path/to/mounted_directory}}

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

umount {{[-a|--all]}}