findmnt

FINDMNT(8)                   System Administration                  FINDMNT(8)

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 "+" 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>).

       -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
       Karel Zak <kzak@redhat.com>

SEE ALSO
       fstab(5), mount(8)

REPORTING BUGS
       For bug reports, use the issue tracker at
       https://github.com/karelzak/util-linux/issues.

AVAILABILITY
       The findmnt command is part of the util-linux package which can be
       downloaded from Linux Kernel Archive
       <https://www.kernel.org/pub/linux/utils/util-linux/>.

util-linux 2.37.2                 2024-04-09                        FINDMNT(8)