1 .TH FINDMNT 8 "June 2015" "util-linux" "System Administration"
3 findmnt \- find a filesystem
10 .IR device | mountpoint
16 .RB [ \-\-target | \-\-mountpoint ]
20 will list all mounted filesystems or search for a filesystem. The
22 command is able to search in
26 .IR /proc/self/mountinfo .
31 is not given, all filesystems are shown.
33 The device may be specified by device name, major:minor numbers,
34 filesystem label or UUID, or partition label or UUID. Note that
38 behavior where a device name may be interpreted
39 as a mountpoint (and vice versa) if the \fB\-\-target\fR, \fB\-\-mountpoint\fR or
40 \fB\-\-source\fR options are not specified.
42 The command prints all mounted filesystems in the tree-like format by default.
46 Disable all built-in filters and print all filesystems.
48 .BR \-a , " \-\-ascii"
49 Use ascii characters for tree formatting.
51 .BR \-b , " \-\-bytes"
52 Print the SIZE, USED and AVAIL columns in bytes rather than in a human-readable format.
54 .BR \-C , " \-\-nocanonicalize"
55 Do not canonicalize paths at all. This option affects the comparing of paths
56 and the evaluation of tags (LABEL, UUID, etc.).
58 .BR \-c , " \-\-canonicalize"
59 Canonicalize all printed paths.
64 This option is equivalent to
65 .B \-o\ SOURCE,FSTYPE,SIZE,USED,AVAIL,USE%,TARGET
66 but excludes all pseudo filesystems.
67 Use \fB\-\-all\fP to print all filesystems.
69 .BR \-d , " \-\-direction \fIword\fP"
70 The search direction, either
75 .BR \-e , " \-\-evaluate"
76 Convert all tags (LABEL, UUID, PARTUUID or PARTLABEL) to the corresponding device names.
78 .BR \-F , " \-\-tab\-file \fIpath\fP"
79 Search in an alternative file. If used with \fB\-\-fstab\fP, \fB\-\-mtab\fP
80 or \fB\-\-kernel\fP, then it overrides the default paths. If specified more
81 than once, then tree-like output is disabled (see the \fB\-\-list\fP option).
83 .BR \-f , " \-\-first\-only"
84 Print the first matching filesystem only.
87 Display help text and exit.
89 .BR \-i , " \-\-invert"
90 Invert the sense of matching.
93 Use JSON output format.
95 .BR \-k , " \-\-kernel"
97 .IR /proc/self/mountinfo .
98 The output is in the tree-like format. This is the default. The output
99 contains only mount options maintained by kernel (see also \fB\-\-mtab)\fP.
101 .BR \-l , " \-\-list"
102 Use the list output format. This output format is automatically enabled if the
103 output is restricted by the \fB\-t\fP, \fB\-O\fP, \fB\-S\fP or \fB\-T\fP
104 option and the option \fB\-\-submounts\fP is not used or if more that one
105 source file (the option \fB\-F\fP) is specified.
107 .BR \-M , " \-\-mountpoint \fIpath\fP"
108 Explicitly define the mountpoint file or directory. See also \fB\-\-target\fP.
110 .BR \-m , " \-\-mtab"
113 The output is in the list format by default (see \fB\-\-tree\fP). The output may include user
116 .BR \-N , " \-\-task \fItid\fP"
117 Use alternative namespace /proc/<tid>/mountinfo rather than the default
118 /proc/self/mountinfo. If the option is specified more than once, then
119 tree-like output is disabled (see the \fB\-\-list\fP option). See also the
123 .BR \-n , " \-\-noheadings"
124 Do not print a header line.
126 .BR \-O , " \-\-options \fIlist\fP"
127 Limit the set of printed filesystems. More than one option
128 may be specified in a comma-separated list. The
132 options are cumulative in effect. It is different from
134 in that each option is matched exactly; a leading
136 at the beginning does not have global meaning. The "no" can used for
137 individual items in the list. The "no" prefix interpretation can be disabled
140 .BR \-o , " \-\-output \fIlist\fP"
141 Define output columns. See the \fB\-\-help\fP output to get a list of the
142 currently supported columns. The
144 column contains tree formatting if the
148 options are not specified.
150 The default list of columns may be extended if \fIlist\fP is
151 specified in the format \fI+list\fP (e.g. \fBfindmnt \-o +PROPAGATION\fP).
153 .BR \-P , " \-\-pairs"
154 Use key="value" output format. All potentially unsafe characters are hex-escaped (\\x<code>).
156 .BR \-p , " \-\-poll\fR[\fI=list\fR]"
157 Monitor changes in the /proc/self/mountinfo file. Supported actions are: mount,
158 umount, remount and move. More than one action may be specified in a
159 comma-separated list. All actions are monitored by default.
161 The time for which \fB\-\-poll\fR will block can be restricted with the \fB\-\-timeout\fP
162 or \fB\-\-first\-only\fP options.
164 The standard columns always use the new version of the information from the
165 mountinfo file, except the umount action which is based on the original
166 information cached by
168 The poll mode allows to use extra columns:
172 mount, umount, move or remount action name; this column is enabled by default
175 available for umount and move actions
178 available for umount and remount actions
181 .BR \-R , " \-\-submounts"
182 Print recursively all submounts for the selected filesystems. The restrictions
183 defined by options \fB\-t\fP, \fB\-O\fP, \fB\-S\fP, \fB\-T\fP and
184 \fB\%\-\-direction\fP are not applied to submounts. All submounts are always
185 printed in tree-like order. The option enables the tree-like output format by
186 default. This option has no effect for \fB\-\-mtab\fP or \fB\-\-fstab\fP.
189 Use raw output format. All potentially unsafe characters are hex-escaped (\\x<code>).
191 .BR \-S , " \-\-source \fIspec\fP"
192 Explicitly define the mount source. Supported specifications are \fIdevice\fR,
193 \fImaj\fB:\fImin\fR, \fBLABEL=\fIlabel\fR, \fBUUID=\fIuuid\fR,
194 \fBPARTLABEL=\fIlabel\fR and \fBPARTUUID=\fIuuid\fR.
196 .BR \-s , " \-\-fstab"
199 The output is in the list format (see \fB\-\-list\fR).
201 .BR \-T , " \-\-target \fIpath\fP"
202 Define the mount target. If \fIpath\fR
203 is not a mountpoint file or directory, then
205 checks the \fIpath\fR elements in reverse order to get the mountpoint (this feature is
206 supported only when searching in kernel files and unsupported for \fB\-\-fstab\fP). It's
207 recommended to use the option \fB\-\-mountpoint\fR when checks of \fIpath\fR elements are
208 unwanted and \fIpath\fR is a strictly specified mountpoint.
210 .BR \-t , " \-\-types \fIlist\fP"
211 Limit the set of printed filesystems. More than one type may be
212 specified in a comma-separated list. The list of filesystem types can be
215 to specify the filesystem types on which no action should be taken. For
220 Enable tree-like output if possible. The options is silently ignored for
221 tables where is missing child-parent relation (e.g. fstab).
223 .BR \-U , " \-\-uniq"
224 Ignore filesystems with duplicate mount targets, thus effectively skipping
225 over-mounted mount points.
227 .BR \-u , " \-\-notruncate"
228 Do not truncate text in columns. The default is to not truncate the
235 columns. This option disables text truncation also in all other columns.
237 .BR \-v , " \-\-nofsroot"
238 Do not print a [/dir] in the SOURCE column for bind mounts or btrfs subvolumes.
240 .BR \-w , " \-\-timeout \fImilliseconds\fP"
241 Specify an upper limit on the time for which \fB\-\-poll\fR will block, in milliseconds.
243 .BR \-x , " \-\-verify"
244 Check mount table content. The default is to verify
246 parsability and usability. It's possible to use this option also with \fB\-\-tab\-file\fP.
247 It's possible to specify source (device) or target (mountpoint) to filter mount table. The option
248 \fB\-\-verbose\fP forces findmnt to print more details.
251 Force findmnt to print more information (\fB\-\-verify\fP only for now).
253 .IP "\fBfindmnt \-\-fstab \-t nfs\fP"
254 Prints all NFS filesystems defined in
256 .IP "\fBfindmnt \-\-fstab /mnt/foo\fP"
259 filesystems where the mountpoint directory is /mnt/foo. It also prints bind mounts where /mnt/foo
261 .IP "\fBfindmnt \-\-fstab \-\-target /mnt/foo\fP"
264 filesystems where the mountpoint directory is /mnt/foo.
265 .IP "\fBfindmnt \-\-fstab \-\-evaluate\fP"
268 filesystems and converts LABEL= and UUID= tags to the real device names.
269 .IP "\fBfindmnt \-n \-\-raw \-\-evaluate \-\-output=target LABEL=/boot\fP"
270 Prints only the mountpoint where the filesystem with label "/boot" is mounted.
271 .IP "\fBfindmnt \-\-poll \-\-mountpoint /mnt/foo\fP"
272 Monitors mount, unmount, remount and move on /mnt/foo.
273 .IP "\fBfindmnt \-\-poll=umount \-\-first-only \-\-mountpoint /mnt/foo\fP"
274 Waits for /mnt/foo unmount.
275 .IP "\fBfindmnt \-\-poll=remount \-t ext3 \-O ro\fP"
276 Monitors remounts to read-only mode on all ext3 filesystems.
278 .IP LIBMOUNT_FSTAB=<path>
279 overrides the default location of the fstab file
280 .IP LIBMOUNT_MTAB=<path>
281 overrides the default location of the mtab file
282 .IP LIBMOUNT_DEBUG=all
283 enables libmount debug output
284 .IP LIBSMARTCOLS_DEBUG=all
285 enables libsmartcols debug output
286 .IP LIBSMARTCOLS_DEBUG_PADDING=on
287 use visible padding characters. Requires enabled LIBSMARTCOLS_DEBUG.
290 Karel Zak <kzak@redhat.com>
296 The findmnt command is part of the util-linux package and is available from
297 https://www.kernel.org/pub/linux/utils/util-linux/.