LSBLK(8) System Administration LSBLK(8)NAME
lsblk - list block devices
SYNOPSIS
lsblk [options]
lsblk [options] device...
DESCRIPTION
lsblk lists information about all or the specified block devices. The
lsblk command reads the sysfs filesystem 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 default output from options like --topol‐
ogy and --fs is subject to change, so whenever possible you should
avoid using default outputs in your scripts. Always explicitly define
expected columns by --output columns in environment where a stable out‐
put is required.
OPTIONS-a, --all
lsblk does not list empty devices by default. This option dis‐
ables this restriction.
-b, --bytes
Print the SIZE column in bytes rather than in human-readable
format.
-d, --nodeps
Don't print device holders or slaves. For example "lsblk
--nodeps /dev/sda" prints information about the sda device only.
-D, --discard
Print information about the discard (TRIM, UNMAP) capabilities
for each device.
-e, --exclude list
Exclude the devices specified by a 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.
-I, --include list
Include devices specified by a comma-separated list of major
device numbers only. The filter is applied to the top-level
devices.
-f, --fs
Output info about filesystems. This option is equivalent to "-o
NAME,FSTYPE,LABEL,MOUNTPOINT". The authoritative information
about filesystems and raids is provided by the blkid(8) command.
-h, --help
Print a help text and exit.
-i, --ascii
Use ASCII characters for tree formatting.
-m, --perms
Output info about device owner, group and mode. This option is
equivalent to "-o NAME,SIZE,OWNER,GROUP,MODE".
-l, --list
Use the list output format.
-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.
-P, --pairs
Use key="value" output format. All potentially unsafe characters
are hex-escaped (\x<code>).
-r, --raw
Use the raw output format. All potentially unsafe characters are
hex-escaped (\x<code>) in NAME, KNAME, LABEL, PARTLABEL and
MOUNTPOINT columns.
-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".
-V, --version
Output version information and exit.
NOTES
For partitions, some information (e.g. queue attributes) is inherited
from the parent device.
The lsblk needs to be able to lookup sysfs path by major:minor, which
is done done by using /sys/dev/block. The block sysfs appeared in ker‐
nel 2.6.27 (October 2008). In case of problem with new enough kernel
check that CONFIG_SYSFS was enabled at the time of kernel build.
AUTHORS
Milan Broz <mbroz@redhat.com>
Karel Zak <kzak@redhat.com>
ENVIRONMENT
LIBMOUNT_DEBUG=0xffff
enables debug output.
SEE ALSOfindmnt(8), blkid(8), ls(1)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 April 2010 LSBLK(8)