Provided by: util-linux_2.41-4ubuntu4_amd64 
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, then it tries to read LABELs, UUIDs and filesystem types from the block device. In
this case root permissions are necessary.
By default, the command prints all block devices (except RAM disks) in a tree-like format. The same
device can be repeated in the tree if it relates to other devices. The --merge option is recommended for
more complicated setups to gather groups of devices and describe complex N:M relationships.
The tree-like output (or children[] array in the JSON output) is enabled only if NAME column it present
in the output or when --tree command line option is used. See also --nodeps and --list to control the
tree formatting.
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.
Use lsblk --list-columns to get a list of all available columns.
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.
The relationship between block devices and filesystems is not always one-to-one. The filesystem may use
more block devices, or the same filesystem may be accessible by more paths. This is the reason why lsblk
provides MOUNTPOINT and MOUNTPOINTS (pl.) columns. The column MOUNTPOINT displays only one mount point
(usually the last mounted instance of the filesystem), and the column MOUNTPOINTS displays by multi-line
cell all mount points associated with the device.
OPTIONS
-A, --noempty
Don’t print empty devices.
-a, --all
Disable all built-in filters and list all empty devices and RAM disk devices too.
-b, --bytes
Print the sizes in bytes rather than in a human-readable format.
By default, the unit, sizes are expressed in, is byte, and unit prefixes are in power of 2^10 (1024).
Abbreviations of symbols are exhibited truncated in order to reach a better readability, by
exhibiting alone the first letter of them; examples: "1 KiB" and "1 MiB" are respectively exhibited
as "1 K" and "1 M", then omitting on purpose the mention "iB", which is part of these abbreviations.
-H, --list-columns
List the available columns, use with --json or --raw to get output in machine-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,FSVER,LABEL,UUID,FSAVAIL,FSUSE%,MOUNTPOINTS. The authoritative information about
filesystems and raids is provided by the blkid(8) command.
--hyperlink[=mode]
Print mountpoint paths as terminal hyperlinks. The mode can be set to "always", "never", or "auto".
The optional argument when can be set to "auto", "never", or "always". If the when argument is
omitted, it will default to "auto". The "auto" setting means that hyperlinks will only be used if the
output is on a terminal.
-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. Note
that children[] is used only if NAME column or --tree is used.
-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, --nvme
Output info about NVMe devices only.
-v, --virtio
Output info about virtio devices only.
-n, --noheadings
Do not print a header line.
-o, --output list
Specify which output columns to print. Use --list-columns 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>). See also option --shell.
-p, --paths
Print full device paths.
-Q, --filter expr
Print only the devices that meet the conditions specified by the expr. The filter is assessed prior
to lsblk collecting data for all output columns. Only the necessary data for the lazy evaluation of
the expression is retrieved from the system. This approach can enhance performance when compared to
post-filtering, as commonly done by tools such as grep(1).
This feature is EXPERIMENTAL. See also scols-filter(5). For example exclude sda and sdb, but print
everything else ('!~' is a negative regular expression matching operator):
lsblk --filter 'NAME !~ "sd[ab]"'
--highlight expr
Colorize lines matching the expression. This feature is EXPERIMENTAL. See also scols-filter(5).
--ct name [: param [: function ]]
Define a custom counter. The counters are printed after the standard output. The name is the custom
name of the counter, the optional param is the name of the column to be used for the counter, and the
optional function specifies the aggregation function, supported functions are: count, min, max, or
sum. The default is count.
If the param is not specified, then the counter counts the number of lines. This feature is
EXPERIMENTAL. See also --ct-filter.
For example, --ct MyCounter:SIZE:sum will count the summary for SIZE from all lines; and to count the
number of SATA disks, it is possible to use:
lsblk --ct-filter 'TYPE=="disk" && TRAN=="sata"' --ct "Number of SATA devices"
--ct-filter expr
Define a restriction for the next counter. This feature is EXPERIMENTAL. See also --ct and
scols-filter(5). For example, aggregate sizes by device type:
lsblk --ct-filter 'TYPE=="part"' --ct Partitions:SIZE:sum \
--ct-filter 'TYPE=="disk"' --ct WholeDisks:SIZE:sum
-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.
-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 is used by the 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.
-y, --shell
The column name will be modified to contain only characters allowed for shell variable identifiers,
for example, MIN_IO and FSUSE_PCT instead of MIN-IO and FSUSE%. This is usable, for example, with
--pairs. Note that this feature has been automatically enabled for --pairs in version 2.37, but due
to compatibility issues, now it’s necessary to request this behavior by --shell.
-z, --zoned
Print the zone related information 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.
--properties-by list
This option specifies the methods used by lsblk to gather information about filesystems and partition
tables. The list is a comma-separated list of method names. The default setting is "file,udev,blkid".
The supported methods are:
udev
Reads data from udev DB. If unsuccessful, it continues to the next probing method.
blkid
Reads data directly from the device using libblkid. If unsuccessful, it continues to the next
probing method.
file
Reads data from a file. This method is only used if the --sysroot option is specified. This
method always stops probing if used.
none
Does not probe. This method always stops probing.
-h, --help
Display help text and exit.
-V, --version
Display version and exit.
EXIT STATUS
0
success
1
failure
32
none of specified devices found
64
some specified devices found, some not found
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.
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.
AUTHORS
Milan Broz <gmazyland@gmail.com>, Karel Zak <kzak@redhat.com>
SEE ALSO
blkid(8), findmnt(8) ls(1), scols-filter(5)
REPORTING BUGS
For bug reports, use the issue tracker <https://github.com/util-linux/util-linux/issues>.
AVAILABILITY
The lsblk command is part of the util-linux package which can be downloaded from Linux Kernel Archive
<https://www.kernel.org/pub/linux/utils/util-linux/>.
util-linux 2.41 2025-03-17 LSBLK(8)