NAME | SYNOPSIS | DESCRIPTION | OPTIONS | NOTES | RETURN CODES | AUTHORS | ENVIRONMENT | SEE ALSO | AVAILABILITY | COLOPHON

LSBLK(8)                    System Administration                   LSBLK(8)

NAME         top

       lsblk - list block devices

SYNOPSIS         top

       lsblk [options] [device...]

DESCRIPTION         top

       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 udev.

OPTIONS         top

       -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 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.

       -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.

NOTES         top

       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         top

       0      success

       1      failure

       32     not found all specified devices

       64     some specified devices found, some not found

AUTHORS         top

       Milan Broz <mbroz@redhat.com>
       Karel Zak <kzak@redhat.com>

ENVIRONMENT         top

       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         top

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

AVAILABILITY         top

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

COLOPHON         top

       This page is part of the util-linux (a random collection of Linux
       utilities) project.  Information about the project can be found at 
       ⟨https://www.kernel.org/pub/linux/utils/util-linux/⟩.  If you have a
       bug report for this manual page, send it to
       util-linux@vger.kernel.org.  This page was obtained from the
       project's upstream Git repository 
       ⟨git://git.kernel.org/pub/scm/utils/util-linux/util-linux.git⟩ on
       2016-10-04.  If you discover any rendering problems in this HTML ver‐
       sion of the page, or you believe there is a better or more up-to-date
       source for the page, or you have corrections or improvements to the
       information in this COLOPHON (which is not part of the original man‐
       ual page), send a mail to man-pages@man7.org

util-linux                      February 2013                       LSBLK(8)