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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | EXIT STATUS | ENVIRONMENT | NOTES | AUTHORS | 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, then 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 and --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 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.
-d, --nodeps
Do not print holder devices or slaves. For example, lsblk
--nodeps /dev/sda prints information about the sda device
only.
-E, --dedup column
Use column as a de-duplication key to de-duplicate output
tree. If the key is not available for the device, or the
device is a partition and parental whole-disk device
provides the same key than the device is always printed.
The usual use case is to de-duplicate output on system
multi-path devices, for example by -E WWN.
-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 not specified. The
filter is applied to the top-level devices only. This may
be confusing for --list output format where hierarchy of
the devices is not obvious.
-f, --fs
Output info about filesystems. This option is equivalent
to -o NAME,FSTYPE,LABEL,UUID,FSAVAIL,FSUSE%,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. This may be confusing for --list
output format where hierarchy of the devices is not
obvious.
-i, --ascii
Use ASCII characters for tree formatting.
-J, --json
Use JSON output format. It's strongly recommended to use
--output and also --tree if necessary.
-l, --list
Produce output in the form of a list. The output does not
provide information about relationships between devices
and since version 2.34 every device is printed only once
if --pairs or --raw not specified (the parsable outputs
are maintained in backwardly compatible way).
-M, --merge
Group parents of sub-trees to provide more readable output
for RAIDs and Multi-path devices. The tree-like output is
required.
-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 columns may affect
tree-like output. The default is to use tree for the
column 'NAME' (see also --tree).
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. The
output lines are still ordered by dependencies. All
potentially unsafe value characters are hex-escaped
(\x<code>). The key (variable name) will be modified to
contain only characters allowed for a shell variable
identifiers, for example, MIN_IO and FSUSE_PCT instead of
MIN-IO and FSUSE%.
-p, --paths
Print full device paths.
-r, --raw
Produce output in raw format. The output lines are still
ordered by dependencies. 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, --tree[=column]
Force tree-like output format. If column is specified,
then a tree is printed in the column. The default is NAME
column.
-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.
-w, --width number
Specifies output width as a number of characters. The
default is the number of the terminal columns, and if not
executed on a terminal, then output width is not
restricted at all by default. This option also forces
lsblk to assume that terminal control characters and
unsafe characters are not allowed. The expected use-case
is for example when lsblk used by watch(1) command.
-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.
-z, --zoned
Print the zone model for each device.
--sysroot directory
Gather data for a Linux instance other than the instance
from which the lsblk command is issued. The specified
directory is the system root of the Linux instance to be
inspected. The real device nodes in the target directory
can be replaced by text files with udev attributes.
0 success
1 failure
32 none of specified devices found
64 some specified devices found, some not found
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
LIBSMARTCOLS_DEBUG.
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.
Milan Broz <mbroz@redhat.com>
Karel Zak <kzak@redhat.com>
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
2020-12-18. (At that time, the date of the most recent commit
that was found in the repository was 2020-12-17.) 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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