lsblk Man page

LSBLK(8) System Administration LSBLK(8)

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.

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

-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 infor‐
mation 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 poten‐
tially unsafe characters are hex-escaped (\x).

-p, --paths
Print full device paths.

-r, --raw
Produce output in raw format. All potentially unsafe characters
are hex-escaped (\x) 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 equiva‐
lent 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.

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.

RETURN CODES
0 success

1 failure

32 not found all specified devices

64 some specified devices found, some not found

AUTHORS
Milan Broz
Karel Zak

ENVIRONMENT
LIBBLKID_DEBUG=all
enables libblkid debug output.

LIBMOUNT_DEBUG=all
enables libmount debug output.

LIBSMARTCOLS_DEBUG=all
enables libsmartcols debug output.

SEE ALSO

findmnt(8), blkid(8), ls

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

util-linux February 2013 LSBLK(8)

Ils en parlent aussi

command - list block device information - Linux Howto's Guide