findmnt(8) — Linux manual page

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | ENVIRONMENT | EXAMPLE | AUTHORS | SEE ALSO | AVAILABILITY | COLOPHON

FINDMNT(8)                System Administration               FINDMNT(8)

NAME         top

       findmnt - find a filesystem

SYNOPSIS         top

       findmnt [options]

       findmnt [options] device|mountpoint

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

DESCRIPTION         top

       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         top

       -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 "+" prefix.

       -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 +list (e.g., findmnt -o
              +PROPAGATION).

       --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(8).  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.

       -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).

       -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         top

       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. Requires enabled
              LIBSMARTCOLS_DEBUG.

EXAMPLE         top

       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         top

       Karel Zak <kzak@redhat.com>

SEE ALSO         top

       fstab(5), mount(8)

AVAILABILITY         top

       The findmnt command is part of the util-linux package and is
       available from
       https://www.kernel.org/pub/linux/utils/util-linux/.

COLOPHON         top

       This page is part of the util-linux (a random collection of Linux
       utilities) project.  Information about the project can be found
       at ⟨https://www.kernel.org/pub/linux/utils/util-linux/⟩.  If you
       have a bug report for this manual page, send it to
       util-linux@vger.kernel.org.  This page was obtained from the
       project's upstream Git repository
       ⟨git://git.kernel.org/pub/scm/utils/util-linux/util-linux.git⟩ on
       2021-03-21.  (At that time, the date of the most recent commit
       that was found in the repository was 2021-03-19.)  If you
       discover any rendering problems in this HTML version of the page,
       or you believe there is a better or more up-to-date source for
       the page, or you have corrections or improvements to the
       information in this COLOPHON (which is not part of the original
       manual page), send a mail to man-pages@man7.org

util-linux                      May 2018                      FINDMNT(8)

Pages that refer to this page: eject(1)mount(2)fstab(5)mount_namespaces(7)findmnt(8)lsblk(8)mount(8)