Dr Andrew Scott G7VAV

MBCS, MIET, Member ACM, Member IEEE

Senior Lecturer
School of Computing
and Communications

D35 InfoLab21
Lancaster University
Lancaster, LA1 4WA
United Kingdom

April 2024
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FINDMNT

Section: System Administration (8)
Updated: April 2010
Index Return to Main Contents

NAME

findmnt - find a filesystem

SYNOPSIS

findmnt [options]

findmnt [options] device|mountpoint

findmnt [options] [--source] device [--target] mountpoint

DESCRIPTION

findmnt will list all mounted filesytems or search for a filesystem. The findmnt command is able to search in /etc/fstab, /etc/fstab.d, /etc/mtab or /proc/self/mountinfo. If device or mountpoint is not given, all filesystems are shown.

The command prints all mounted filesystems in the tree-like format by default.

OPTIONS

-h, --help

Print help and exit.

-s, --fstab

Search in /etc/fstab and /etc/fstab.d. The output is in the list format (see --list).

-m, --mtab

Search in /etc/mtab. The output is in the list format (see --list).

-k, --kernel

Search in /proc/self/mountinfo. The output is in the tree-like format. This is the default.

-c, --canonicalize

Canonicalize all printed paths.

-d, --direction word

The search direction - forward or backward.

-e, --evaluate

Convert all tags (LABEL or UUID) to the device names.

-f, --first-only

Print the first matching filesystem only.

-i, --invert

Invert the sense of matching.

-l, --list

Use the list output format. This output format is automatically enabled if the output is restricted by -t, -O, -S or -T option and the option --submounts is not used.

-v, --nofsroot

Do not print a [/dir] in the SOURCE column for bind-mounts or btrfs subvolumes.

-n, --noheadings

Do not print a header line.

-u, --notruncate

Do not truncate text in columns. The default is to not truncate the TARGET, SOURCE, UUID and LABEL columns. This option disables text truncation also in all other columns.

-O, --options list

Limit the set of printed filesystems. More than one option may be specified in a comma-separated list. The -t and -O options are cumulative in effect. It is different from -t in that each option is matched exactly; a leading no at the beginning of one option does not negate the rest. For more details see mount(8).

-o, --output list

Define output columns. Currently supported are ACTION, SOURCE, TARGET, OLD-TARGET, FSTYPE, OPTIONS, OLD-OPTIONS, VFS-OPTIONS, FS-OPTIONS, LABEL and UUID. The TARGET column contains tree formatting if the --list or --raw options are not specified.

-p, --poll[=list]

Monitor changes in the /proc/self/mountinfo file. Supported actions are: mount, umount, remount and move. More than one action may be specified in a comma-separated list. All actions are monitored by default.

The time for which --poll will block can be restricted with the --timeout or --first-only options.

The standard columns always use the new version of the information from the mountinfo file, except the umount action which is based on the original information cached by findmnt(8). The poll mode allows to use extra columns:

ACTION: mount, umount, move or remount action name; this column is enabled by default
OLD-TARGET: available for umount and move actions
OLD-OPTIONS: available for umount and remount actions

-r, --raw

Use raw output format.

-a, --ascii

Use ascii characters for tree formatting.

-t, --types list

Limit the set of printed filesystems. More than one type may be specified in a comma-separated list. The list of filesystem types can be prefixed with no to specify the filesystem types on which no action should be taken. For more details see mount(8).

-R, --submounts

Print recursively all submounts for the selected filesystems. The restrictions defined by options -t, -O, -S, -T and --direction are not applied to submounts. All submounts are always printed in tree-like order. The option enables the tree-like output format by default. This option has no effect for --mtab or --fstab.

-S, --source spec

Explicitly define the mount source. Supported are device, LABEL= and UUID=.

-T, --target dir

Explicitly define the mount target (mountpoint directory).

-w, --timeout milliseconds

Specify an upper limit on the time for which --poll will block, in milliseconds.

EXAMPLES

findmnt --fstab -t nfs: Prints all nfs filesystems defined in /etc/fstab.
findmnt --fstab /mnt/foo: Prints all /etc/fstab filesystems where the mountpoint directory is /mnt/foo. It also prints bind mounts where /mnt/foo is a source.
findmnt --fstab --target /mnt/foo: Prints all /etc/fstab filesystems where the mountpoint directory is /mnt/foo.
findmnt --fstab --evaluate: Prints all /etc/fstab filesystems and converts LABEL= and UUID= tags to the real device names.
findmnt -n --raw --evaluate --output=target LABEL=/boot: Prints only the mountpoint where the filesystem with label "/boot" is mounted.
findmnt --poll --target /mnt/foo: Monitors mount, umount, remount and move on /mnt/foo.
findmnt --poll=umount --first-only --target /mnt/foo: Waits for /mnt/foo umount.
findmnt --poll=remount -t ext3 -O ro: Monitors remounts to read-only mode on all ext3 filesystems.