Umount Linux Commands
What is Linux umount Command?
Explanation
umount COMMAND:Unmount command is used to detach or disconnect the external disc or drive connected to the computer system.SYNTAX :
umount [options] filesystem
OPTIONS:
-V
Print version and exit.
-h
Print help message and exit.
-v
Verbose mode.
-n
Unmount without writing in /etc/mtab.
-r
In case unmounting fails, try to remount read-only.
-d
In case the unmounted device was a loop device, also free this loop device.
-a
All of the file systems described in /etc/mtab are unmounted.
-t vfstype
Indicate that the actions should only be taken on file systems of the specified type. More than one type may be specified in a comma separated list. The list of file system types can be prefixed with no to specify the file system types on which no action should be taken.
-O options
Indicate that the actions should only be taken on file systems with the specified options in /etc/fstab. More than one option type may be specified in a comma separated list. Each option can be prefixed with no to specify options for which no action should be taken.
-f
Force unmount (in case of an unreachable NFS system).
-l
Lazy unmount. Detach the filesystem from the filesystem hierarchy now, and cleanup all references to the filesystem as soon as it is not busy anymore.
EXAMPLE:
- To detach the file systems (e.g) USB / Hard disk
umount /dev/cdrom
umount [options] filesystem
OPTIONS:
-V
Print version and exit.
-h
Print help message and exit.
-v
Verbose mode.
-n
Unmount without writing in /etc/mtab.
-r
In case unmounting fails, try to remount read-only.
-d
In case the unmounted device was a loop device, also free this loop device.
-a
All of the file systems described in /etc/mtab are unmounted.
-t vfstype
Indicate that the actions should only be taken on file systems of the specified type. More than one type may be specified in a comma separated list. The list of file system types can be prefixed with no to specify the file system types on which no action should be taken.
-O options
Indicate that the actions should only be taken on file systems with the specified options in /etc/fstab. More than one option type may be specified in a comma separated list. Each option can be prefixed with no to specify options for which no action should be taken.
-f
Force unmount (in case of an unreachable NFS system).
-l
Lazy unmount. Detach the filesystem from the filesystem hierarchy now, and cleanup all references to the filesystem as soon as it is not busy anymore.
EXAMPLE:
- To detach the file systems (e.g) USB / Hard disk
umount /dev/cdrom
| -V | Print version and exit. |
| -h | Print help message and exit. |
| -v | Verbose mode. |
| -n | Unmount without writing in /etc/mtab. |
| -r | In case unmounting fails, try to remount read-only. |
| -d | In case the unmounted device was a loop device, also free this loop device. |
| -a | All of the file systems described in /etc/mtab are unmounted. |
| -t vfstype | Indicate that the actions should only be taken on file systems of the specified type. More than one type may be specified in a comma separated list. The list of file system types can be prefixed with no to specify the file system types on which no action should be taken. |
| -O options | Indicate that the actions should only be taken on file systems with the specified options in /etc/fstab. More than one option type may be specified in a comma separated list. Each option can be prefixed with no to specify options for which no action should be taken. |
| -f | Force unmount (in case of an unreachable NFS system). |
| -l | Lazy unmount. Detach the filesystem from the filesystem hierarchy now, and cleanup all references to the filesystem as soon as it is not busy anymore. |
- To detach the file systems (e.g) USB / Hard disk
umount /dev/cdrom
