findmnt - find a filesystem
findmnt [options]
findmnt [options] device|mountpoint
findmnt [options] [--source] device
[--target|--mountpoint] mountpoint
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.
- -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 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).
Karel Zak <kzak@redhat.com>
The findmnt command is part of the util-linux package and is
available from https://www.kernel.org/pub/linux/utils/util-linux/.