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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | ENVIRONMENT | EXAMPLE | AUTHORS | SEE ALSO | AVAILABILITY | COLOPHON |
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FINDMNT(8) System Administration FINDMNT(8)
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
Produce output in the form of key="value" pairs. All
potentially unsafe value characters are hex-escaped
(\x<code>). The key (variable name) will be modified to
contain only characters allowed for a shell variable
identifiers, for example, FS_OPTIONS and USE_PCT instead
of FS-OPTIONS and USE%.
-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).
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.
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.
Karel Zak <kzak@redhat.com>
fstab(5), mount(8)
The findmnt command is part of the util-linux package and is
available from
https://www.kernel.org/pub/linux/utils/util-linux/.
This page is part of the util-linux (a random collection of Linux
utilities) project. Information about the project can be found
at ⟨https://www.kernel.org/pub/linux/utils/util-linux/⟩. If you
have a bug report for this manual page, send it to
util-linux@vger.kernel.org. This page was obtained from the
project's upstream Git repository
⟨git://git.kernel.org/pub/scm/utils/util-linux/util-linux.git⟩ on
2020-12-18. (At that time, the date of the most recent commit
that was found in the repository was 2020-12-17.) If you
discover any rendering problems in this HTML version of the page,
or you believe there is a better or more up-to-date source for
the page, or you have corrections or improvements to the
information in this COLOPHON (which is not part of the original
manual page), send a mail to man-pages@man7.org
util-linux May 2018 FINDMNT(8)
Pages that refer to this page: eject(1), mount(2), fstab(5), mount_namespaces(7), findmnt(8), lsblk(8), mount(8)
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