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. The default
       output, is subject to change. So whenever possible, you should avoid using default output
       in your scripts. Always explicitly define expected columns by using --output columns-list
       in environments where a stable output is required.

       The relationship between block devices and filesystems is not always one-to-one. The
       filesystem may use more block devices. This is why findmnt provides  SOURCE and SOURCES
       (pl.) columns. The column SOURCES displays all devices where it is possible to find the
       same filesystem  UUID (or another tag specified in fstab when executed with --fstab and
       --evaluate).

OPTIONS

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

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

       -b, --bytes
           Print the sizes in bytes rather than in a human-readable format.

           By default, the unit, sizes are expressed in, is byte, and unit prefixes are in power
           of 2^10 (1024). Abbreviations of symbols are exhibited truncated in order to reach a
           better readability, by exhibiting alone the first letter of them; examples: "1 KiB"
           and "1 MiB" are respectively exhibited as "1 K" and "1 M", then omitting on purpose
           the mention "iB", which is part of these abbreviations.

       -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. See also -I, --dfi options.

       -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 for the SOURCE column. It’s an unusual situation, but the same tag may be
           duplicated (used for more devices). For this purpose, there is SOURCES (pl.) column.
           This column displays by multi-line cell all devices where the tag is detected by
           libblkid. This option makes sense for fstab only.

       -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, --list-columns
           List the available columns, use with --json or --raw to get output in machine-readable
           format.

       -I, --dfi
           Imitate the output of df(1) with its -i option. This option is equivalent to -o
           SOURCE,FSTYPE,INO.TOTAL,INO.USED,INO.AVAIL,INO.USE%,TARGET but excludes all pseudo
           filesystems. Use --all to print all filesystems.

       -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>). See also option --shell.

           Note that SOURCES column, use multi-line cells. In these cases, the column use an
           array-like formatting in the output, for example name=("aaa" "bbb" "ccc").

       -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>).

           Note that column SOURCES, use multi-line cells. In these cases, the column may produce
           more strings on the same line.

       --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.

       -y, --shell
           The column name will be modified to contain only characters allowed for shell variable
           identifiers. This is usable, for example, with --pairs. Note that this feature has
           been automatically enabled for --pairs in version 2.37, but due to compatibility
           issues, now it’s necessary to request this behavior by --shell.

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

       -V, --version
           Print version and exit.

EXIT STATUS

       The exit value is 0 if there is something to display, or 1 on any error (for example if no
       filesystem is found based on the user’s filter specification, or the device path or
       mountpoint does not exist).

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/util-linux/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/>.