Linux "findmnt" Command Line Options and Examples

find a filesystem

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

Usage:

findmnt [options]


    findmnt [options] device|mountpoint

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

Related Commands

mount

Command Line Options:

-A

Disable all built-in filters and print all filesystems.


                            findmnt -A ...

-a

Use ascii characters for tree formatting.


                            findmnt -a ...

-b

Print the SIZE, USED and AVAIL columns in bytes rather than in a human-readable format.


                            findmnt -b ...

-C

Do not canonicalize paths at all. This option affects the comparing of paths and the evaluation of tags (LABEL, UUID, etc.).


                            findmnt -C ...

-c

Canonicalize all printed paths.


                            findmnt -c ...

-D

Imitate the output of df(1). This option is equivalent to -o SOURCE,FSTYPE,SIZE,USED,AVAIL,USE%,TARGET but excludes allpseudo filesystems. Use --all to print all filesystems.


                            findmnt -D ...

-d

The search direction, either forward or backward.


                            findmnt -d ...

-e

Convert all tags (LABEL, UUID, PARTUUID or PARTLABEL) to the corresponding device names.


                            findmnt -e ...

-F

Search in an alternative file. If used with --fstab, --mtab or --kernel, then it overrides the default paths. If specifiedmore than once, then tree-like output is disabled (see the --list option).


                            findmnt -F ...

-f

Print the first matching filesystem only.


                            findmnt -f ...

-h

Display help text and exit.


                            findmnt -h ...

-i

Invert the sense of matching.


                            findmnt -i ...

-J

Use JSON output format.


                            findmnt -J ...

-k

Search in /proc/self/mountinfo. The output is in the tree-like format. This is the default. The output contains only mountoptions maintained by kernel (see also --mtab).


                            findmnt -k ...

-l

Use the list output format. This output format is automatically enabled if the output is restricted by the -t, -O, -S or -Toption and the option --submounts is not used or if more that one source file (the option -F) is specified.


                            findmnt -l ...

-M

Explicitly define the mountpoint file or directory. See also --target.


                            findmnt -M ...

-m

Search in /etc/mtab. The output is in the list format by default (see --tree). The output may include user space mountoptions.


                            findmnt -m ...

-N

Use alternative namespace /proc/<tid>/mountinfo rather than the default /proc/self/mountinfo. If the option is specified morethan once, then tree-like output is disabled (see the --list option). See also the unshare(1) command.


                            findmnt -N ...

-n

Do not print a header line.


                            findmnt -n ...

-O

Limit the set of printed filesystems. More than one option may be specified in a comma-separated list. The -t and -O optionsare cumulative in effect. It is different from -t in that each option is matched exactly; a leading no at the beginning doesnot have global meaning. The "no" can used for individual items in the list. The "no" prefix interpretation can be disabledby "+" prefix.


                            findmnt -O ...

-o

Define output columns. See the --help output to get a list of the currently supported columns. The TARGET column containstree formatting if the --list or --raw options are not specified.The default list of columns may be extended if list is specified in the format +list (e.g. findmnt -o +PROPAGATION).


                            findmnt -o ...

-P

Use key="value" output format. All potentially unsafe characters are hex-escaped (\x<code>).


                            findmnt -P ...

-p

Monitor changes in the /proc/self/mountinfo file. Supported actions are: mount, umount, remount and move. More than oneaction 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 isbased 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 defaultOLD-TARGETavailable for umount and move actionsOLD-OPTIONSavailable for umount and remount actions


                            findmnt -p ...

-R

Print recursively all submounts for the selected filesystems. The restrictions defined by options -t, -O, -S, -T and


                            findmnt -R ...

-r

Use raw output format. All potentially unsafe characters are hex-escaped (\x<code>).


                            findmnt -r ...

-S

Explicitly define the mount source. Supported specifications are device, maj:min, LABEL=label, UUID=uuid, PARTLABEL=label andPARTUUID=uuid.


                            findmnt -S ...

-s

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


                            findmnt -s ...

-T

Define the mount target. If path is not a mountpoint file or directory, then findmnt checks the path elements in reverseorder to get the mountpoint (this feature is supported only when searching in kernel files and unsupported for --fstab). It'srecommended to use the option --mountpoint when checks of path elements are unwanted and path is a strictly specified mount‐point.


                            findmnt -T ...

-t

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


                            findmnt -t ...

--tree

Enable tree-like output if possible. The options is silently ignored for tables where is missing child-parent relation (e.g.fstab).


                            findmnt --tree ...

-U

Ignore filesystems with duplicate mount targets, thus effectively skipping over-mounted mount points.


                            findmnt -U ...

-u

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


                            findmnt -u ...

-v

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


                            findmnt -v ...

-w

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


                            findmnt -w ...

-x

Check mount table content. The default is to verify /etc/fstab parsability and usability. It's possible to use this optionalso with --tab-file. It's possible to specify source (device) or target (mountpoint) to filter mount table. The option


                            findmnt -x ...

--verbose

forces findmnt to print more details.


                            findmnt --verbose ...