Provided by: util-linux_2.34-0.1ubuntu9.6_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
       and --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 and RAM disk devices.

       -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.

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

       -E, --dedup column
              Use column as a de-duplication key to de-duplicate output tree. If the key  is  not
              available  for  the  device,  or  the device is a partition and parental whole-disk
              device provides the same key than the device is always printed.

              The usual use case is to de-duplicate output  on  system  multi-path  devices,  for
              example by -E WWN.

       -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 if --all  is  not  specified.
              The  filter  is  applied  to  the top-level devices only. This may be confusing for
              --list output format where hierarchy of the devices is not obvious.

       -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. This may be confusing for --list
              output format where hierarchy of the devices is not obvious.

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

       -J, --json
              Use JSON output format.  It's strongly recommended to use --output and also  --tree
              if necessary.

       -l, --list
              Produce output in the form of a list. The output does not provide information about
              relationships between devices and since version 2.34 every device is  printed  only

       -M, --merge
              Group parents of sub-trees to provide more readable output for RAIDs and Multi-path
              devices. The tree-like output is required.

       -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
              columns.  The columns may affect tree-like output.  The default is to use tree  for
              the column 'NAME' (see also --tree).

              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, --tree[=column]
              Force tree-like output format.  If column is specified, then a tree is  printed  in
              the column.  The default is NAME column.

       -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.

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

        --sysroot directory
              Gather data for a Linux instance other than  the  instance  from  which  the  lsblk
              command  is  issued.   The  specified  directory  is  the  system root of the Linux
              instance to be inspected.  This option is designed for the testing purpose.


       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 lsblk debug output.

              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