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 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 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.
-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/<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).
-P, --pairs
Use key="value" output format. All potentially unsafe
characters are hex-escaped (\x<code>).
-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
information 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
--direction 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<code>).
-S, --source spec
Explicitly define the mount source. Supported specifications
are device, maj:min, LABEL=label, UUID=uuid, PARTLABEL=label and
PARTUUID=uuid.
-s, --fstab
Search in /etc/fstab. The output is in the list format (see
--list).
-T, --target path
Define the mount target. If path is not a mountpoint file or
directory, then findmnt checks the path elements in reverse
order to get the mountpoint (this feature is supported only when
searching in kernel files and unsupported for --fstab). It's
recommended to use the option --mountpoint when checks of path
elements are 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
effectively 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.
-x, --verify
Check mount table content. The default is to verify /etc/fstab
parsability and usability. It's possible to use this option also
with --tab-file. It's possible to specify source (device) or
target (mountpoint) to filter mount table. The option --verbose
forces findmnt to print more details.
--verbose
Force findmnt to print more information (--verify only for now).
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=<path>
overrides the default location of the fstab file
LIBMOUNT_MTAB=<path>
overrides the default location of the mtab file
LIBMOUNT_DEBUG=all
enables libmount debug output
LIBSMARTCOLS_DEBUG=all
enables libsmartcols debug output
LIBSMARTCOLS_DEBUG_PADDING=on
use visible padding characters. Requires enabled
LIBSMARTCOLS_DEBUG.
AUTHORS
Karel Zak <kzak@redhat.com>
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/.
Opportunity
Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.
Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.
Free Software
Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.
Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.
Free Books
The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.
Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.
Education
Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.
Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.
