FINDMNT(8) System Administration 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 inter-
preted 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 com-
paring 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 op-
tion 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 de-
fault (see --tree). The output may include user space mount op-
tions.
-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 op-
tion). 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 speci-
fied.
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 charac-
ters are hex-escaped (\x<code>).
-p, --poll[=list]
Monitor changes in the /proc/self/mountinfo file. Supported ac-
tions are: mount, umount, remount and move. More than one ac-
tion 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 informa-
tion 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 al-
ways 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 or-
der 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 mount-
point.
-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 effec-
tively 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 LIBSMART-
COLS_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/.
util-linux May 2018 FINDMNT(8)