tldr/pages/linux/umount.md

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# 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 --read-only {{path/to/mounted_directory}}`
- Recursively unmount each specified directory:
`umount --recursive {{path/to/mounted_directory}}`
- Unmount all mounted filesystems (except the `proc` filesystem):
`umount -a`