FINDMNT(8)

NAME
findmnt - find a filesystem

SYNOPSIS
findmnt [options]

findmnt [options] device|mountpoint

findmnt [options] [--source] device [--target|--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 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
    Use key="value" output format. All potentially unsafe 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(8). The poll mode allows to use 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).

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.

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. Requires enabled LIBSMARTCOLS_DEBUG.

AUTHORS
Karel Zak <kzak@redhat.com>

SEE ALSO
fstab(5), mount(8)

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