1FINDMNT(8) System Administration FINDMNT(8)
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6 findmnt - find a filesystem
7
9 findmnt [options]
10 findmnt [options] device|mountpoint
12 findmnt [options] [--source] device [--target path|--mountpoint
14 mountpoint]
15
17 findmnt will list all mounted filesystems or search for a filesystem.
18 The findmnt command is able to search in /etc/fstab, /etc/mtab or
19 /proc/self/mountinfo. If device or mountpoint is not given, all
20 filesystems are shown.
21 The device may be specified by device name, major:minor numbers,
23 filesystem label or UUID, or partition label or UUID. Note that findmnt
24 follows mount(8) behavior where a device name may be interpreted as a
25 mountpoint (and vice versa) if the --target, --mountpoint or --source
26 options are not specified.
27 The command-line option --target accepts any file or directory and then
29 findmnt displays the filesystem for the given path.
30 The command prints all mounted filesystems in the tree-like format by
32 default.
33 The relationship between block devices and filesystems is not always
35 one-to-one. The filesystem may use more block devices. This is why
36 findmnt provides SOURCE and SOURCES (pl.) columns. The column SOURCES
37 displays all devices where it is possible to find the same filesystem
38 UUID (or another tag specified in fstab when executed with --fstab and
39 --evaluate).
40
42 -A, --all
43 Disable all built-in filters and print all filesystems.
44 -a, --ascii
46 Use ascii characters for tree formatting.
47 -b, --bytes
49 Print the sizes in bytes rather than in a human-readable format.
50 By default, the unit, sizes are expressed in, is byte, and unit
52 prefixes are in power of 2^10 (1024). Abbreviations of symbols are
53 exhibited truncated in order to reach a better readability, by
54 exhibiting alone the first letter of them; examples: "1 KiB" and "1
55 MiB" are respectively exhibited as "1 K" and "1 M", then omitting
56 on purpose the mention "iB", which is part of these abbreviations.
57 -C, --nocanonicalize
59 Do not canonicalize paths at all. This option affects the comparing
60 of paths and the evaluation of tags (LABEL, UUID, etc.).
61 -c, --canonicalize
63 Canonicalize all printed paths.
64 --deleted
66 Print filesystems where target (mountpoint) is marked as deleted by
67 kernel.
68 -D, --df
70 Imitate the output of df(1). This option is equivalent to -o
71 SOURCE,FSTYPE,SIZE,USED,AVAIL,USE%,TARGET but excludes all pseudo
72 filesystems. Use --all to print all filesystems.
73 -d, --direction word
75 The search direction, either forward or backward.
76 -e, --evaluate
78 Convert all tags (LABEL, UUID, PARTUUID, or PARTLABEL) to the
79 corresponding device names for the SOURCE column. It’s an unusual
80 situation, but the same tag may be duplicated (used for more
81 devices). For this purpose, there is SOURCES (pl.) column. This
82 column displays by multi-line cell all devices where the tag is
83 detected by libblkid. This option makes sense for fstab only.
84 -F, --tab-file path
86 Search in an alternative file. If used with --fstab, --mtab or
87 --kernel, then it overrides the default paths. If specified more
88 than once, then tree-like output is disabled (see the --list
89 option).
90 -f, --first-only
92 Print the first matching filesystem only.
93 -i, --invert
95 Invert the sense of matching.
96 -J, --json
98 Use JSON output format.
99 -k, --kernel
101 Search in /proc/self/mountinfo. The output is in the tree-like
102 format. This is the default. The output contains only mount options
103 maintained by kernel (see also --mtab).
104 -l, --list
106 Use the list output format. This output format is automatically
107 enabled if the output is restricted by the -t, -O, -S or -T option
108 and the option --submounts is not used or if more that one source
109 file (the option -F) is specified.
110 -M, --mountpoint path
112 Explicitly define the mountpoint file or directory. See also
113 --target.
114 -m, --mtab
116 Search in /etc/mtab. The output is in the list format by default
117 (see --tree). The output may include user space mount options.
118 -N, --task tid
120 Use alternative namespace /proc/<tid>/mountinfo rather than the
121 default /proc/self/mountinfo. If the option is specified more than
122 once, then tree-like output is disabled (see the --list option).
123 See also the unshare(1) command.
124 -n, --noheadings
126 Do not print a header line.
127 -O, --options list
129 Limit the set of printed filesystems. More than one option may be
130 specified in a comma-separated list. The -t and -O options are
131 cumulative in effect. It is different from -t in that each option
132 is matched exactly; a leading no at the beginning does not have
133 global meaning. The "no" can used for individual items in the list.
134 The "no" prefix interpretation can be disabled by "+" prefix.
135 -o, --output list
137 Define output columns. See the --help output to get a list of the
138 currently supported columns. The TARGET column contains tree
139 formatting if the --list or --raw options are not specified.
140 The default list of columns may be extended if list is specified in
142 the format +list (e.g., findmnt -o +PROPAGATION).
143 --output-all
145 Output almost all available columns. The columns that require
146 --poll are not included.
147 -P, --pairs
149 Produce output in the form of key="value" pairs. All potentially
150 unsafe value characters are hex-escaped (\x<code>). See also option
151 --shell.
152 -p, --poll[=list]
154 Monitor changes in the /proc/self/mountinfo file. Supported actions
155 are: mount, umount, remount and move. More than one action may be
156 specified in a comma-separated list. All actions are monitored by
157 default.
158 The time for which --poll will block can be restricted with the
160 --timeout or --first-only options.
161 The standard columns always use the new version of the information
163 from the mountinfo file, except the umount action which is based on
164 the original information cached by findmnt. The poll mode allows
165 using extra columns:
166 ACTION
168 mount, umount, move or remount action name; this column is
169 enabled by default
170 OLD-TARGET
172 available for umount and move actions
173 OLD-OPTIONS
175 available for umount and remount actions
176 --pseudo
178 Print only pseudo filesystems.
179 --shadow
181 Print only filesystems over-mounted by another filesystem.
182 -R, --submounts
184 Print recursively all submounts for the selected filesystems. The
185 restrictions defined by options -t, -O, -S, -T and --direction are
186 not applied to submounts. All submounts are always printed in
187 tree-like order. The option enables the tree-like output format by
188 default. This option has no effect for --mtab or --fstab.
189 -r, --raw
191 Use raw output format. All potentially unsafe characters are
192 hex-escaped (\x<code>).
193 --real
195 Print only real filesystems.
196 -S, --source spec
198 Explicitly define the mount source. Supported specifications are
199 device, maj:min, LABEL=label, UUID=uuid, PARTLABEL=label and
200 PARTUUID=uuid.
201 -s, --fstab
203 Search in /etc/fstab. The output is in the list format (see
204 --list).
205 -T, --target path
207 Define the mount target. If path is not a mountpoint file or
208 directory, then findmnt checks the path elements in reverse order
209 to get the mountpoint (this feature is supported only when
210 searching in kernel files and unsupported for --fstab). It’s
211 recommended to use the option --mountpoint when checks of path
212 elements are unwanted and path is a strictly specified mountpoint.
213 -t, --types list
215 Limit the set of printed filesystems. More than one type may be
216 specified in a comma-separated list. The list of filesystem types
217 can be prefixed with no to specify the filesystem types on which no
218 action should be taken. For more details see mount(8).
219 --tree
221 Enable tree-like output if possible. The options is silently
222 ignored for tables where is missing child-parent relation (e.g.,
223 fstab).
224 --shadowed
226 Print only filesystems over-mounted by another filesystem.
227 -U, --uniq
229 Ignore filesystems with duplicate mount targets, thus effectively
230 skipping over-mounted mount points.
231 -u, --notruncate
233 Do not truncate text in columns. The default is to not truncate the
234 TARGET, SOURCE, UUID, LABEL, PARTUUID, PARTLABEL columns. This
235 option disables text truncation also in all other columns.
236 -v, --nofsroot
238 Do not print a [/dir] in the SOURCE column for bind mounts or btrfs
239 subvolumes.
240 -w, --timeout milliseconds
242 Specify an upper limit on the time for which --poll will block, in
243 milliseconds.
244 -x, --verify
246 Check mount table content. The default is to verify /etc/fstab
247 parsability and usability. It’s possible to use this option also
248 with --tab-file. It’s possible to specify source (device) or target
249 (mountpoint) to filter mount table. The option --verbose forces
250 findmnt to print more details.
251 --verbose
253 Force findmnt to print more information (--verify only for now).
254 --vfs-all
256 When used with VFS-OPTIONS column, print all VFS (fs-independent)
257 flags. This option is designed for auditing purposes to list also
258 default VFS kernel mount options which are normally not listed.
259 -y, --shell
261 The column name will be modified to contain only characters allowed
262 for shell variable identifiers. This is usable, for example, with
263 --pairs. Note that this feature has been automatically enabled for
264 --pairs in version 2.37, but due to compatibility issues, now it’s
265 necessary to request this behavior by --shell.
266 -h, --help
268 Display help text and exit.
269 -V, --version
271 Print version and exit.
272
274 The exit value is 0 if there is something to display, or 1 on any error
275 (for example if no filesystem is found based on the user’s filter
276 specification, or the device path or mountpoint does not exist).
277
279 LIBMOUNT_FSTAB=<path>
280 overrides the default location of the fstab file
281 LIBMOUNT_MTAB=<path>
283 overrides the default location of the mtab file
284 LIBMOUNT_DEBUG=all
286 enables libmount debug output
287 LIBSMARTCOLS_DEBUG=all
289 enables libsmartcols debug output
290 LIBSMARTCOLS_DEBUG_PADDING=on
292 use visible padding characters.
293
295 findmnt --fstab -t nfs
296 Prints all NFS filesystems defined in /etc/fstab.
297 findmnt --fstab /mnt/foo
299 Prints all /etc/fstab filesystems where the mountpoint directory is
300 /mnt/foo. It also prints bind mounts where /mnt/foo is a source.
301 findmnt --fstab --target /mnt/foo
303 Prints all /etc/fstab filesystems where the mountpoint directory is
304 /mnt/foo.
305 findmnt --fstab --evaluate
307 Prints all /etc/fstab filesystems and converts LABEL= and UUID=
308 tags to the real device names.
309 findmnt -n --raw --evaluate --output=target LABEL=/boot
311 Prints only the mountpoint where the filesystem with label "/boot"
312 is mounted.
313 findmnt --poll --mountpoint /mnt/foo
315 Monitors mount, unmount, remount and move on /mnt/foo.
316 findmnt --poll=umount --first-only --mountpoint /mnt/foo
318 Waits for /mnt/foo unmount.
319 findmnt --poll=remount -t ext3 -O ro
321 Monitors remounts to read-only mode on all ext3 filesystems.
322
324 Karel Zak <kzak@redhat.com>
325
327 fstab(5), mount(8)
328
330 For bug reports, use the issue tracker at
331 https://github.com/util-linux/util-linux/issues.
332
334 The findmnt command is part of the util-linux package which can be
335 downloaded from Linux Kernel Archive
336 <https://www.kernel.org/pub/linux/utils/util-linux/>.
337util-linux 2.38 2022-02-17 FINDMNT(8)