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 –topol‐

ogy, is subject to change. So whenever possible, you should avoid using default out‐

puts 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.

lsblk [options] [device…]

-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 num‐

bers. 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 sup‐

ported 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 char‐

acters 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 output 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 num‐

bers, 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 not found all specified devices

64 some specified devices found, some not found

LIBBLKID_DEBUG=all

enables libblkid debug output.

LIBMOUNT_DEBUG=all

enables libmount debug output.

LIBSMARTCOLS_DEBUG=all

enables libsmartcols debug output.

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