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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | NOTES | RETURN CODES | AUTHORS | ENVIRONMENT | SEE ALSO | AVAILABILITY | COLOPHON |
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LSBLK(8) System Administration LSBLK(8)
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. 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
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.
-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.
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 none of specified devices found
64 some specified devices found, some not found
Milan Broz <mbroz@redhat.com>
Karel Zak <kzak@redhat.com>
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.
ls(1), blkid(8), findmnt(8)
The lsblk command is part of the util-linux package and is available
from https://www.kernel.org/pub/linux/utils/util-linux/.
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
2018-02-02. (At that time, the date of the most recent commit that
was found in the repository was 2018-02-01.) If you discover any
rendering problems in this HTML version 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 manual page), send a mail to
man-pages@man7.org
util-linux February 2013 LSBLK(8)
Pages that refer to this page: eject(1), mount(2), fstab(5), blkdeactivate(8), blkid(8), cfdisk(8), findfs(8)
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HTML rendering created 2018-02-02 by Michael Kerrisk, author of The Linux Programming Interface, maintainer of the Linux man-pages project. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH.
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