Provided by: util-linux_2.31.1-0.4ubuntu3.7_amd64 bug


       lsblk - list block devices


       lsblk [options] [device...]


       lsblk  lists  information  about  all available or the specified block devices.  The lsblk
       command reads the sysfs filesystem and udev db to gather information. If the  udev  db  is
       not  available  or  lsblk  is  compiled without udev support than it tries to read LABELs,
       UUIDs and filesystem types from the block  device.  In  this  case  root  permissions  are

       The  command prints all block devices (except RAM disks) in a tree-like format by default.
       Use lsblk --help to get a list of all available columns.

       The default output, as well as the default output from options like --fs  and  --topology,
       is  subject  to  change.   So whenever possible, you should avoid using default outputs in
       your scripts.  Always explicitly define expected columns by using --output columns-list in
       environments where a stable output is required.

       Note  that  lsblk  might be executed in time when udev does not have all information about
       recently added or modified devices yet. In this case it  is  recommended  to  use  udevadm
       settle before lsblk to synchronize with udev.


       -a, --all
              Also list empty devices.  (By default they are skipped.)

       -b, --bytes
              Print the SIZE column in bytes rather than in a human-readable format.

       -D, --discard
              Print information about the discarding capabilities (TRIM, UNMAP) for each device.

       -z, --zoned
              Print the zone model for each device.

       -d, --nodeps
              Do not print holder devices or slaves.  For example, lsblk --nodeps /dev/sda prints
              information about the sda device only.

       -e, --exclude list
              Exclude the devices specified by the comma-separated list of major device  numbers.
              Note  that  RAM  disks (major=1) are excluded by default.  The filter is applied to
              the top-level devices only.

       -f, --fs
              Output   info    about    filesystems.     This    option    is    equivalent    to
              -o NAME,FSTYPE,LABEL,UUID,MOUNTPOINT.     The   authoritative   information   about
              filesystems and raids is provided by the blkid(8) command.

       -h, --help
              Display help text and exit.

       -I, --include list
              Include devices specified by the comma-separated list of major device numbers.  The
              filter is applied to the top-level devices only.

       -i, --ascii
              Use ASCII characters for tree formatting.

       -J, --json
              Use JSON output format.

       -l, --list
              Produce output in the form of a list.

       -m, --perms
              Output  info  about  device  owner,  group  and mode.  This option is equivalent to
              -o NAME,SIZE,OWNER,GROUP,MODE.

       -n, --noheadings
              Do not print a header line.

       -o, --output list
              Specify which output columns to print.  Use --help to get a list of  all  supported

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

       -O, --output-all
              Output all available columns.

       -P, --pairs
              Produce output in the form of key="value" pairs.  All potentially unsafe characters
              are hex-escaped (\x<code>).

       -p, --paths
              Print full device paths.

       -r, --raw
              Produce  output  in  raw format.  All potentially unsafe characters are hex-escaped
              (\x<code>) in the NAME, KNAME, LABEL, PARTLABEL and MOUNTPOINT columns.

       -S, --scsi
              Output info about SCSI devices only.  All partitions, slaves and holder devices are

       -s, --inverse
              Print  dependencies  in  inverse  order. If the --list output is requested then the
              lines are still ordered by dependencies.

       -t, --topology
              Output  info  about  block-device  topology.   This   option   is   equivalent   to

       -V, --version
              Display version information and exit.

       -x, --sort column
              Sort  output  lines by column. This option enables --list output format by default.
              It is possible to use the option --tree to force tree-like output and than the tree
              branches are sorted by the column.


       For  partitions,  some  information  (e.g.  queue attributes) is inherited from the parent

       The lsblk command needs to be able to look up each block device  by  major:minor  numbers,
       which  is  done  by  using  /sys/dev/block.  This sysfs block directory appeared in kernel
       2.6.27 (October 2008).  In  case  of  problems  with  a  new  enough  kernel,  check  that
       CONFIG_SYSFS was enabled at the time of the kernel build.


       0      success

       1      failure

       32     none of specified devices found

       64     some specified devices found, some not found


       Milan Broz <>
       Karel Zak <>


              enables libblkid debug output.

              enables libmount debug output.

              enables libsmartcols debug output.

              use visible padding characters. Requires enabled LIBSMARTCOLS_DEBUG.


       ls(1), blkid(8), findmnt(8)


       The   lsblk   command   is   part   of  the  util-linux  package  and  is  available  from