lsblk Command Reference

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 –topology 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 output is required.

Name

lsblk – list block devices

Synopsis

lsblk [options]
lsblk [options] device…

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Options
-a, --all
lsblk does not list empty devices by default. This option disables 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 equivalent to "-o NAME,ALIGNMENT,MIN-IO,OPT-IO,PHY-SEC,LOG-SEC,ROTA,SCHED,RQ-SIZE".
-V, --version
Output version information and exit.

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