findmnt (8) Linux Manual Page

findmnt – find a filesystem

Synopsis

findmnt [options]

findmnt [options] device|mountpoint

findmnt [options] [–source] device [–target path|–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-line option –target accepts any file or directory and then findmnt displays the filesystem for the given path.

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. 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 (