huschi.net

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.  If  the udev db is not available or lsblk is com-
       piled without udev support than it tries  to  read  LABELs,  UUIDs  and
       filesystem  types  from the block device. In this case root permissions
       are necessary.
       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.
OPTIONS
       -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.
       -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 if --all is no  specified.   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  infor-
              mation  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 poten-
              tially 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 equiva-
              lent       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
              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.
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 CONFIG_SYSFS was enabled
       at the time of the kernel build.
RETURN CODES
       0      success
       1      failure
       32     none of specified devices found
       64     some specified devices found, some not found
AUTHORS
       Milan Broz <mbroz AT redhat.com>
       Karel Zak <kzak AT redhat.com>
ENVIRONMENT
       LSBLK_DEBUG=all
              enables lsblk debug output.
       LIBBLKID_DEBUG=all
              enables libblkid debug output.
       LIBMOUNT_DEBUG=all
              enables libmount debug output.
       LIBSMARTCOLS_DEBUG=all
              enables libsmartcols debug output.
       LIBSMARTCOLS_DEBUG_PADDING=on
              use  visible  padding  characters.  Requires  enabled  LIBSMART-
              COLS_DEBUG.
SEE ALSO
       ls(1), blkid(8), findmnt(8)
AVAILABILITY
       The  lsblk  command  is part of the util-linux package and is available
       from https://www.kernel.org/pub/linux/utils/util-linux/.
util-linux                       February 2013                        LSBLK(8)