lsblk

List information about block devices

Description

The lsblk command lists information about all available or specified block devices. It displays dependencies between devices but does not list RAM disks. Block devices include hard drives, flash drives, CD-ROMs, etc. The lsblk command is part of the util-linux package.

Options

-a, --all            # Display all devices.
-b, --bytes          # Print the SIZE column in bytes rather than in a human-readable format.
-d, --nodeps         # Don't print device holders or slaves.
-D, --discard        # Print information about the discarding capabilities (TRIM/UNMAP) for each device.
-e, --exclude <list> # Exclude devices by major number.
-f, --fs             # Output info about file systems.
-h, --help           # Display help information.
-i, --ascii          # Use ASCII characters for tree formatting.
-m, --perms          # Output info about device owner, group and mode.
-l, --list           # Use list output format.
-n, --noheadings     # Do not print a header line.
-o, --output <list>  # Specify which output columns to print.
-P, --pairs          # Use key="value" output format.
-r, --raw            # Use raw output format.
-t, --topology       # Output info about topology.

Examples

By default, lsblk lists block devices in a tree-like format:

lsblk

NAME   MAJ:MIN rm   SIZE RO type mountpoint
sda      8:0    0 232.9G  0 disk 
├─sda1   8:1    0  46.6G  0 part /
├─sda2   8:2    0     1K  0 part 
├─sda5   8:5    0   190M  0 part /boot
├─sda6   8:6    0   3.7G  0 part [SWAP]
├─sda7   8:7    0  93.1G  0 part /data
└─sda8   8:8    0  89.2G  0 part /personal
sr0     11:0    1  1024M  0 rom

The columns are:

1. NAME: Device name.
2. MAJ:MIN: Major and minor device numbers.
3. RM: Whether the device is removable (1 if yes).
4. SIZE: Capacity of the device.
5. RO: Whether the device is read-only (1 if yes).
6. TYPE: Device type (e.g., disk, part, rom).
7. MOUNTPOINT: Where the device is mounted.

Show all devices, including empty ones:

lsblk -a

Show permissions and ownership:

lsblk -m

Show size in bytes for a specific device:

lsblk -b /dev/sda
# or
lsblk --bytes /dev/sda

List format without headings:

lsblk -nl

List SCSI devices:

lsblk -S

Reverse dependency order:

lsblk -s