LinuxCommandLibrary

umount

Detach filesystems from mount points

TLDR

Unmount a filesystem by device path
$ sudo umount [path/to/device]
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Unmount a filesystem by mount point
$ sudo umount [path/to/mounted_directory]
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Remount read-only when unmount fails
$ sudo umount -r [path/to/mounted_directory]
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Recursively unmount each directory
$ sudo umount -R [path/to/mounted_directory]
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Unmount all mounted filesystems (except proc)
$ sudo umount -a
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SYNOPSIS

umount [options] target...

DESCRIPTION

umount detaches a filesystem from its mount point, making it no longer accessible. The filesystem can be specified by its source device or mount point directory.
A filesystem cannot be unmounted while it is "busy" - that is, while files on it are open or processes have their working directory there. Use lsof or fuser to find processes using the filesystem.

PARAMETERS

-a, --all

Unmount all filesystems (except proc)
-r, --read-only
If unmount fails, try to remount read-only
-R, --recursive
Recursively unmount directories
-l, --lazy
Lazy unmount (detach now, cleanup later)
-f, --force
Force unmount (for unreachable NFS)
-n, --no-mtab
Don't write to /etc/mtab
-t, --types _type_
Unmount only filesystems of specified type
-v, --verbose
Verbose mode

CAVEATS

Requires root privileges unless the user option was specified in fstab. Busy filesystems cannot be unmounted normally. Lazy unmount (-l) can leave filesystem in inconsistent state. Force unmount (-f) only works for NFS. Part of the util-linux package.

HISTORY

umount has been a standard Unix command since the earliest versions, part of the util-linux package on Linux. The lazy unmount option (-l) was added in Linux 2.4.11.

SEE ALSO

mount(8), fuser(1), lsof(8), findmnt(8)

> TERMINAL_GEAR

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