lsblk

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 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 col‐umns-list in environments where a stable output is required.

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,MOUNTPOINT. The authoritative information about filesystems and raids is provided by the blkid(8) command.
-h, --help	Print a 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.
-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).
-P, --pairs	Produce output in the form of key=”value” pairs. All potentially unsafe characters 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.

EXAMPLE

[alvin@poppy ~]$ lsblk
NAME                MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda                   8:0    0   20G  0 disk
├─sda1                8:1    0  500M  0 part /boot
├─sda2                8:2    0    1G  0 part [SWAP]
└─sda3                8:3    0 18.5G  0 part
  └─vg_root-lv_root 253:0    0 18.5G  0 lvm  /
sdb                   8:16   0  300G  0 disk
└─sdb1                8:17   0   20G  0 part /data
[alvin@poppy ~]$ lsblk -S
NAME HCTL       TYPE VENDOR   MODEL             REV TRAN
sda  2:0:0:0    disk VMware,  VMware Virtual S 1.0  spi
sdb  2:0:1:0    disk VMware,  VMware Virtual S 1.0  spi
[alvin@poppy ~]$ lsblk /dev/sdb
NAME   MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sdb      8:16   0  300G  0 disk
└─sdb1   8:17   0   20G  0 part /data