findmnt Man page

FINDMNT(8) System Administration FINDMNT(8)

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 filesytems 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, maj:min, filesystem LABEL
or UUID, or partition PARTUUID or PARTLABEL. Note that findmnt follows
mount(8) behavior where a device name may be interpreted as a mount‐
point (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 column in bytes rather than in a
human-readable format.

-C, –nocanonicalize
Do not canonicalize paths at all. This option affects the com‐
paring of paths and the evaluation of tags (LABEL, UUID, etc.).

-c, –canonicalize
Canonicalize all printed paths.

-D, –df
Imitate the output of df. 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
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.

-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 (see
–list).

-N, –task tid
Use alternative namespace /proc//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 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 speci‐
fied.

The default list of columns may be extended if list is specified
in the format +list (e.g. findmnt -o +PROPAGATION).

-P, –pairs
Use key=”value” output format. All potentially unsafe charac‐
ters are hex-escaped (\x).

-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 informa‐
tion 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

-R, --submounts
Print recursively all submounts for the selected filesystems.
The restrictions defined by options -t, -O, -S, -T and --direc‐
tion 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).

-S, --source spec
Explicitly define the mount source. Supported are device,
maj:min, LABEL=, UUID=, PARTLABEL= or PARTUUID=.

-s, --fstab
Search in /etc/fstab. The output is in the list format (see
--list).

-T, --target path
Define the mount target. If the path is not a mountpoint file or
directory, then findmnt checks path elements in reverse order to
get the mountpoint (this feature is supported only if search in
kernel files and unsupported for --fstab). It's recommended to
use the option --mountpoint when checks of path elements is
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).

-U, --uniq
Ignore filesystems with duplicate mount targets, thus effec‐
tively 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.

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= overrides the default location of the fstab file

LIBMOUNT_MTAB= overrides the default location of the mtab file

LIBMOUNT_DEBUG=all
enables libmount debug output

LIBSMARTCOLS_DEBUG=all
enables libsmartcols debug output

AUTHORS
Karel Zak

SEE ALSO

mount(8), fstab(5)

AVAILABILITY
The findmnt command is part of the util-linux package and is available
from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.

util-linux June 2014 FINDMNT(8)

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