Manual kimenet
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 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  mount‐
       point 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.  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 dif‐
              ferent from -t in that each option is matched exactly; a leading no at  the  begin‐
              ning  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  sup‐
              ported  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 in‐
              cluded.

       -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-sepa‐
              rated 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  de‐
                     fault

              OLD-TARGET
                     available for umount and move actions

              OLD-OPTIONS
                     available for umount and remount actions

       --pseudo
              Print only pseudo filesystems.

       -R, --submounts
              Print recursively all submounts for the selected filesystems.  The restrictions de‐
              fined 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>).

       --real Print only real filesystems.

       -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 find‐
              mnt  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).

       --tree Enable  tree-like  output  if possible.  The options is silently ignored for tables
              where is missing child-parent relation (e.g. fstab).

       -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  trun‐
              cation 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 us‐
              ability. 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
       fstab(5), mount(8)

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

util-linux                                   May 2018                                  FINDMNT(8)

Usage:
 findmnt [options]
 findmnt [options] <device> | <mountpoint>
 findmnt [options] <device> <mountpoint>
 findmnt [options] [--source <device>] [--target <path> | --mountpoint <dir>]

Find a (mounted) filesystem.

Options:
 -s, --fstab            search in static table of filesystems
 -m, --mtab             search in table of mounted filesystems
                          (includes user space mount options)
 -k, --kernel           search in kernel table of mounted
                          filesystems (default)

 -p, --poll[=<list>]    monitor changes in table of mounted filesystems
 -w, --timeout <num>    upper limit in milliseconds that --poll will block

 -A, --all              disable all built-in filters, print all filesystems
 -a, --ascii            use ASCII chars for tree formatting
 -b, --bytes            print sizes in bytes rather than in human readable format
 -C, --nocanonicalize   don't canonicalize when comparing paths
 -c, --canonicalize     canonicalize printed paths
 -D, --df               imitate the output of df(1)
 -d, --direction <word> direction of search, 'forward' or 'backward'
 -e, --evaluate         convert tags (LABEL,UUID,PARTUUID,PARTLABEL) 
                          to device names
 -F, --tab-file <path>  alternative file for -s, -m or -k options
 -f, --first-only       print the first found filesystem only
 -i, --invert           invert the sense of matching
 -J, --json             use JSON output format
 -l, --list             use list format output
 -N, --task <tid>       use alternative namespace (/proc/<tid>/mountinfo file)
 -n, --noheadings       don't print column headings
 -O, --options <list>   limit the set of filesystems by mount options
 -o, --output <list>    the output columns to be shown
     --output-all       output all available columns
 -P, --pairs            use key="value" output format
     --pseudo           print only pseudo-filesystems
 -R, --submounts        print all submounts for the matching filesystems
 -r, --raw              use raw output format
     --real             print only real filesystems
 -S, --source <string>  the device to mount (by name, maj:min, 
                          LABEL=, UUID=, PARTUUID=, PARTLABEL=)
 -T, --target <path>    the path to the filesystem to use
     --tree             enable tree format output is possible
 -M, --mountpoint <dir> the mountpoint directory
 -t, --types <list>     limit the set of filesystems by FS types
 -U, --uniq             ignore filesystems with duplicate target
 -u, --notruncate       don't truncate text in columns
 -v, --nofsroot         don't print [/dir] for bind or btrfs mounts

 -x, --verify           verify mount table content (default is fstab)
     --verbose          print more details

 -h, --help             display this help
 -V, --version          display version

Available output columns:
      SOURCE  source device
      TARGET  mountpoint
      FSTYPE  filesystem type
     OPTIONS  all mount options
 VFS-OPTIONS  VFS specific mount options
  FS-OPTIONS  FS specific mount options
       LABEL  filesystem label
        UUID  filesystem UUID
   PARTLABEL  partition label
    PARTUUID  partition UUID
     MAJ:MIN  major:minor device number
      ACTION  action detected by --poll
  OLD-TARGET  old mountpoint saved by --poll
 OLD-OPTIONS  old mount options saved by --poll
        SIZE  filesystem size
       AVAIL  filesystem size available
        USED  filesystem size used
        USE%  filesystem use percentage
      FSROOT  filesystem root
         TID  task ID
          ID  mount ID
  OPT-FIELDS  optional mount fields
 PROPAGATION  VFS propagation flags
        FREQ  dump(8) period in days [fstab only]
      PASSNO  pass number on parallel fsck(8) [fstab only]

For more details see findmnt(8).