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LSBLK(8)                              System Administration                              LSBLK(8)

NAME
       lsblk - list block devices

SYNOPSIS
       lsblk [options] [device...]

DESCRIPTION
       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 set‐
       tle before lsblk to synchronize with udev.

OPTIONS
       -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.

       -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 filesys‐
              tems 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).

       -p, --paths
              Print full device paths.

       -r, --raw
              Produce output in raw format.  All potentially unsafe  characters  are  hex-escaped
              (\x) 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.

       -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 output column.

NOTES
       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  CON‐
       FIG_SYSFS was enabled at the time of the kernel build.

RETURN CODES
       0      success

       1      failure

       32     not found all specified devices

       64     some specified devices found, some not found

AUTHORS
       Milan Broz 
       Karel Zak 

ENVIRONMENT
       LIBBLKID_DEBUG=all
              enables libblkid debug output.

       LIBMOUNT_DEBUG=all
              enables libmount debug output.

       LIBSMARTCOLS_DEBUG=all
              enables libsmartcols debug output.

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

AVAILABILITY
       The  lsblk  command is part of the util-linux package and is available from ftp://ftp.ker‐
       nel.org/pub/linux/utils/util-linux/.

util-linux                                February 2013                                  LSBLK(8)

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