Section (8) findmnt
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. TheTARGET
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 andPARTUUID=
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_zsingle_quotesz_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_zsingle_quotesz_s possible to use this option also with−−tab−file
. It_zsingle_quotesz_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.