util-linux/misc-utils/findmnt.8.adoc

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= findmnt(8)
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:command: findmnt
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== NAME

findmnt - find a filesystem

== SYNOPSIS

*findmnt* [options]

*findmnt* [options] _device_|_mountpoint_

*findmnt* [options] [*--source*] _device_ [*--target* _path_|*--mountpoint* _mountpoint_]

== DESCRIPTION

*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.

The device may be specified by device name, major:minor numbers, filesystem label or UUID, or partition label or UUID. Note that *findmnt* follows *mount*(8) behavior where a device name may be interpreted as a mountpoint (and vice versa) if the *--target*, *--mountpoint* or *--source* options are not specified.

The command-line option *--target* accepts any file or directory and then *findmnt* displays the filesystem for the given path.

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

== OPTIONS

*-A*, *--all*::
Disable all built-in filters and print all filesystems.

*-a*, *--ascii*::
Use ascii characters for tree formatting.

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

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

*-c*, *--canonicalize*::
Canonicalize all printed paths.

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

*-d*, *--direction* _word_::
The search direction, either *forward* or *backward*.

*-e*, *--evaluate*::
Convert all tags (LABEL, UUID, PARTUUID or PARTLABEL) to the corresponding device names.

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

*-f*, *--first-only*::
Print the first matching filesystem only.

*-h*, *--help*::
Display help text and exit.

*-i*, *--invert*::
Invert the sense of matching.

*-J*, *--json*::
Use JSON output format.

*-k*, *--kernel*::
Search in _/proc/self/mountinfo_. The output is in the tree-like format. This is the default. The output contains only mount options maintained by kernel (see also *--mtab*).

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

*-M*, *--mountpoint* _path_::
Explicitly define the mountpoint file or directory. See also *--target*.

*-m*, *--mtab*::
Search in _/etc/mtab_. The output is in the list format by default (see *--tree*). The output may include user space mount options.

*-N*, *--task* _tid_::
Use alternative namespace _/proc/<tid>/mountinfo_ rather than the default _/proc/self/mountinfo_. If the option is specified more than once, then tree-like output is disabled (see the *--list* option). See also the *unshare*(1) command.

*-n*, *--noheadings*::
Do not print a header line.

*-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 does not have global meaning. The "no" can used for individual items in the list. The "no" prefix interpretation can be disabled by "{plus}" prefix.
//TRANSLATORS: Keep {plus} untranslated.

*-o*, *--output* _list_::
Define output columns. See the *--help* output to get a list of the currently supported columns. The *TARGET* column contains tree 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 _{plus}list_ (e.g., *findmnt -o {plus}PROPAGATION*).
//TRANSLATORS: Keep {plus} untranslated.

*--output-all*::
Output almost all available columns. The columns that require *--poll* are not included.

*-P*, *--pairs*::
Produce output in the form of key="value" pairs. All potentially unsafe value characters are hex-escaped (\x<code>). The key (variable name) will be modified to contain only characters allowed for a shell variable identifiers, for example, FS_OPTIONS and USE_PCT instead of FS-OPTIONS and USE%.

*-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*. The poll mode allows using 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

*--pseudo*::
Print only pseudo filesystems.

*--shadow*::
Print only filesystems over-mounted by another filesystem.

*-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*.

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

*--real*::
Print only real filesystems.

*-S*, *--source* _spec_::
Explicitly define the mount source. Supported specifications are _device_, __maj__**:**_min_, **LABEL=**__label__, **UUID=**__uuid__, **PARTLABEL=**__label__ and **PARTUUID=**__uuid__.

*-s*, *--fstab*::
Search in _/etc/fstab_. The output is in the list format (see *--list*).

*-T*, *--target* _path_::
Define the mount target. If _path_ is not a mountpoint file or directory, then *findmnt* checks the _path_ elements in reverse order to get the mountpoint (this feature is supported only when searching in kernel files and unsupported for *--fstab*). It's recommended to use the option *--mountpoint* when checks of _path_ elements are unwanted and _path_ is a strictly specified mountpoint.

*-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).

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

*--shadowed*::
Print only filesystems over-mounted by another filesystem.

*-U*, *--uniq*::
Ignore filesystems with duplicate mount targets, thus effectively skipping over-mounted mount points.

*-u*, *--notruncate*::
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.

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

*-w*, *--timeout* _milliseconds_::
Specify an upper limit on the time for which *--poll* will block, in milliseconds.

*-x*, *--verify*::
Check mount table content. The default is to verify _/etc/fstab_ parsability and usability. It's possible to use this option also with *--tab-file*. It's possible to specify source (device) or target (mountpoint) to filter mount table. The option *--verbose* forces *findmnt* to print more details.

*--verbose*::
Force *findmnt* to print more information (*--verify* only for now).

*--vfs-all*::
When used with *VFS-OPTIONS* column, print all VFS (fs-independent) flags. This option is designed for auditing purposes to list also default VFS kernel mount options which are normally not listed.

== ENVIRONMENT

*LIBMOUNT_FSTAB*=<path>::
overrides the default location of the fstab file

*LIBMOUNT_MTAB*=<path>::
overrides the default location of the mtab file

*LIBMOUNT_DEBUG*=all::
enables libmount debug output

*LIBSMARTCOLS_DEBUG*=all::
enables libsmartcols debug output

*LIBSMARTCOLS_DEBUG_PADDING*=on::
use visible padding characters.

== 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 --mountpoint /mnt/foo*::
Monitors mount, unmount, remount and move on _/mnt/foo_.

*findmnt --poll=umount --first-only --mountpoint /mnt/foo*::
Waits for _/mnt/foo_ unmount.

*findmnt --poll=remount -t ext3 -O ro*::
Monitors remounts to read-only mode on all ext3 filesystems.

== AUTHORS

mailto:kzak@redhat.com[Karel Zak]

== SEE ALSO

*fstab*(5),
*mount*(8)

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