1FINDMNT(8) System Administration FINDMNT(8)
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6 findmnt - find a filesystem
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9 findmnt [options]
10 findmnt [options] device|mountpoint
12 findmnt [options] [--source] device [--target|--mountpoint] mountpoint
14
16 findmnt will list all mounted filesystems or search for a filesystem.
17 The findmnt command is able to search in /etc/fstab, /etc/mtab or
18 /proc/self/mountinfo. If device or mountpoint is not given, all
19 filesystems are shown.
20 The device may be specified by device name, major:minor numbers,
22 filesystem label or UUID, or partition label or UUID. Note that
23 findmnt follows mount(8) behavior where a device name may be inter‐
24 preted as a mountpoint (and vice versa) if the --target, --mountpoint
25 or --source options are not specified.
26 The command prints all mounted filesystems in the tree-like format by
28 default.
29
31 -A, --all
32 Disable all built-in filters and print all filesystems.
33 -a, --ascii
35 Use ascii characters for tree formatting.
36 -b, --bytes
38 Print the SIZE, USED and AVAIL columns in bytes rather than in a
39 human-readable format.
40 -C, --nocanonicalize
42 Do not canonicalize paths at all. This option affects the com‐
43 paring of paths and the evaluation of tags (LABEL, UUID, etc.).
44 -c, --canonicalize
46 Canonicalize all printed paths.
47 -D, --df
49 Imitate the output of df(1). This option is equivalent to
50 -o SOURCE,FSTYPE,SIZE,USED,AVAIL,USE%,TARGET but excludes all
51 pseudo filesystems. Use --all to print all filesystems.
52 -d, --direction word
54 The search direction, either forward or backward.
55 -e, --evaluate
57 Convert all tags (LABEL, UUID, PARTUUID or PARTLABEL) to the
58 corresponding device names.
59 -F, --tab-file path
61 Search in an alternative file. If used with --fstab, --mtab or
62 --kernel, then it overrides the default paths. If specified
63 more than once, then tree-like output is disabled (see the
64 --list option).
65 -f, --first-only
67 Print the first matching filesystem only.
68 -h, --help
70 Display help text and exit.
71 -i, --invert
73 Invert the sense of matching.
74 -J, --json
76 Use JSON output format.
77 -k, --kernel
79 Search in /proc/self/mountinfo. The output is in the tree-like
80 format. This is the default. The output contains only mount
81 options maintained by kernel (see also --mtab).
82 -l, --list
84 Use the list output format. This output format is automatically
85 enabled if the output is restricted by the -t, -O, -S or -T
86 option and the option --submounts is not used or if more that
87 one source file (the option -F) is specified.
88 -M, --mountpoint path
90 Explicitly define the mountpoint file or directory. See also
91 --target.
92 -m, --mtab
94 Search in /etc/mtab. The output is in the list format by
95 default (see --tree). The output may include user space mount
96 options.
97 -N, --task tid
99 Use alternative namespace /proc/<tid>/mountinfo rather than the
100 default /proc/self/mountinfo. If the option is specified more
101 than once, then tree-like output is disabled (see the --list
102 option). See also the unshare(1) command.
103 -n, --noheadings
105 Do not print a header line.
106 -O, --options list
108 Limit the set of printed filesystems. More than one option may
109 be specified in a comma-separated list. The -t and -O options
110 are cumulative in effect. It is different from -t in that each
111 option is matched exactly; a leading no at the beginning does
112 not have global meaning. The "no" can used for individual items
113 in the list. The "no" prefix interpretation can be disabled by
114 "+" prefix.
115 -o, --output list
117 Define output columns. See the --help output to get a list of
118 the currently supported columns. The TARGET column contains
119 tree formatting if the --list or --raw options are not speci‐
120 fied.
121 The default list of columns may be extended if list is specified
123 in the format +list (e.g. findmnt -o +PROPAGATION).
124 -P, --pairs
126 Use key="value" output format. All potentially unsafe charac‐
127 ters are hex-escaped (\x<code>).
128 -p, --poll[=list]
130 Monitor changes in the /proc/self/mountinfo file. Supported
131 actions are: mount, umount, remount and move. More than one
132 action may be specified in a comma-separated list. All actions
133 are monitored by default.
134 The time for which --poll will block can be restricted with the
136 --timeout or --first-only options.
137 The standard columns always use the new version of the informa‐
139 tion from the mountinfo file, except the umount action which is
140 based on the original information cached by findmnt(8). The
141 poll mode allows to use extra columns:
142 ACTION mount, umount, move or remount action name; this column
144 is enabled by default
145 OLD-TARGET
147 available for umount and move actions
148 OLD-OPTIONS
150 available for umount and remount actions
151 -R, --submounts
153 Print recursively all submounts for the selected filesystems.
154 The restrictions defined by options -t, -O, -S, -T and
155 --direction are not applied to submounts. All submounts are
156 always printed in tree-like order. The option enables the tree-
157 like output format by default. This option has no effect for
158 --mtab or --fstab.
159 -r, --raw
161 Use raw output format. All potentially unsafe characters are
162 hex-escaped (\x<code>).
163 -S, --source spec
165 Explicitly define the mount source. Supported specifications
166 are device, maj:min, LABEL=label, UUID=uuid, PARTLABEL=label and
167 PARTUUID=uuid.
168 -s, --fstab
170 Search in /etc/fstab. The output is in the list format (see
171 --list).
172 -T, --target path
174 Define the mount target. If path is not a mountpoint file or
175 directory, then findmnt checks the path elements in reverse
176 order to get the mountpoint (this feature is supported only when
177 searching in kernel files and unsupported for --fstab). It's
178 recommended to use the option --mountpoint when checks of path
179 elements are unwanted and path is a strictly specified mount‐
180 point.
181 -t, --types list
183 Limit the set of printed filesystems. More than one type may be
184 specified in a comma-separated list. The list of filesystem
185 types can be prefixed with no to specify the filesystem types on
186 which no action should be taken. For more details see mount(8).
187 --tree Enable tree-like output if possible. The options is silently
189 ignored for tables where is missing child-parent relation (e.g.
190 fstab).
191 -U, --uniq
193 Ignore filesystems with duplicate mount targets, thus effec‐
194 tively skipping over-mounted mount points.
195 -u, --notruncate
197 Do not truncate text in columns. The default is to not truncate
198 the TARGET, SOURCE, UUID, LABEL, PARTUUID, PARTLABEL columns.
199 This option disables text truncation also in all other columns.
200 -v, --nofsroot
202 Do not print a [/dir] in the SOURCE column for bind mounts or
203 btrfs subvolumes.
204 -w, --timeout milliseconds
206 Specify an upper limit on the time for which --poll will block,
207 in milliseconds.
208 -x, --verify
210 Check mount table content. The default is to verify /etc/fstab
211 parsability and usability. It's possible to use this option also
212 with --tab-file. It's possible to specify source (device) or
213 target (mountpoint) to filter mount table. The option --verbose
214 forces findmnt to print more details.
215 --verbose
217 Force findmnt to print more information (--verify only for now).
218
220 findmnt --fstab -t nfs
221 Prints all NFS filesystems defined in /etc/fstab.
222 findmnt --fstab /mnt/foo
224 Prints all /etc/fstab filesystems where the mountpoint directory
225 is /mnt/foo. It also prints bind mounts where /mnt/foo is a
226 source.
227 findmnt --fstab --target /mnt/foo
229 Prints all /etc/fstab filesystems where the mountpoint directory
230 is /mnt/foo.
231 findmnt --fstab --evaluate
233 Prints all /etc/fstab filesystems and converts LABEL= and UUID=
234 tags to the real device names.
235 findmnt -n --raw --evaluate --output=target LABEL=/boot
237 Prints only the mountpoint where the filesystem with label
238 "/boot" is mounted.
239 findmnt --poll --mountpoint /mnt/foo
241 Monitors mount, unmount, remount and move on /mnt/foo.
242 findmnt --poll=umount --first-only --mountpoint /mnt/foo
244 Waits for /mnt/foo unmount.
245 findmnt --poll=remount -t ext3 -O ro
247 Monitors remounts to read-only mode on all ext3 filesystems.
248
250 LIBMOUNT_FSTAB=<path>
251 overrides the default location of the fstab file
252 LIBMOUNT_MTAB=<path>
254 overrides the default location of the mtab file
255 LIBMOUNT_DEBUG=all
257 enables libmount debug output
258 LIBSMARTCOLS_DEBUG=all
260 enables libsmartcols debug output
261 LIBSMARTCOLS_DEBUG_PADDING=on
263 use visible padding characters. Requires enabled LIBSMART‐
264 COLS_DEBUG.
265
267 Karel Zak <kzak@redhat.com>
268
270 fstab(5), mount(8)
271
273 The findmnt command is part of the util-linux package and is available
274 from https://www.kernel.org/pub/linux/utils/util-linux/.
275util-linux June 2015 FINDMNT(8)