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 compiled 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 environ-
       ments 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.  (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 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@redhat.com>
       Karel Zak <kzak@redhat.com>

ENVIRONMENT

       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 LIBSMARTCOLS_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)