Provided by: util-linux_2.30.2-0.1ubuntu1_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.

       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


       -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 columns.

              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 ignored.

       -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 -o NAME,ALIGNMENT,MIN-IO,OPT-IO,PHY-SEC,LOG-SEC,ROTA,SCHED,RQ-SIZE,RA,WSAME.

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

       -x, --sort column
              Sort output lines by column. This option enables --list output.


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

       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     not found all specified devices

       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