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How to List All Block Devices in Linux | lsblk Command

Last Updated : 15 Sep, 2024

Understanding the storage devices connected to your Linux system is crucial for efficient system management. The 'lsblk' command, short for "list block devices," is a powerful tool that provides detailed information about block devices such as hard drives, solid-state drives, and other storage-related devices.

Here, we will look into the 'lsblk' command, exploring its syntax, options, and practical implementations.

'lsblk' is used to display details about block devices and these block devices(Except ram disk) are basically those files that represent devices connected to the pc. It queries '/sys' virtual file system and 'udev db' to obtain information that it displays. And it basically displays output in a tree-like structure. This command is part of the util-Linux package, which comes pre-installed on many Linux distributions, providing users with essential system management utilities.

Many Linux distributions do not have lsblk command pre-installed. To install it use the following commands as per your Linux distribution. 

sudo apt-get install util-linux

sudo yum install util-linux-ng

sudo yum install util-linux-ng

The basic syntax of the lsblk command is simple:

lsblk [OPTIONS] [DEVICE...]

Here,

• [OPTIONS] represents the various flags and parameters that can be used with the command.
• [DEVICE...] refers to the specific block devices you want to list. If no device is specified, lsblk will display information for all available block devices.

Options

Description

-a or --all

Display all devices, including empty ones.

-b or --bytes

Print sizes in bytes instead of the more human-readable formats.

-i or --inverse

Invert the output, showing only non-empty devices.

-l or --list

Print output in a list format.

-o or --output

Define the output columns to display.

-p or --pairs

Display key-value pairs for each device.

-t or --tree

Print devices in a tree-like format.

-x or --exclud

Exclude devices that match the specified criteria.

To display block devices. 

lsblk 

This command will display a hierarchical view of all block devices connected to your system, including information about partitions and mount points.

To display empty block devices as well.  

lsblk -a 

This command includes all devices, even empty ones, in the output. It can be useful when you want to see all available devices, including those without any partitions or mount points.

To print size information in bytes. 

lsblk -b

The '-b' option displays sizes in bytes. This can be handy when you need precise size information for block devices.

The '-t' option organizes devices in a tree-like format, making it easier to visualize the relationships between devices and partitions.

lsblk -t

lsblk -z 

lsblk -d 

This will skip all the slave entries. 

To use ASCII characters for tree formatting.  

lsblk -i 

Inverting the output with '-i' will show only non-empty devices. This is useful when you want to focus on devices with existing partitions or mount points.

This will display all details of device owner, group and mode of block devices. 

lsblk -m 

To print selected columns of block-devices. 

lsblk -o SIZE, NAME, MOUNTPOINT 

Use '-o' to customize the output columns. In this example, we specify that we only want to see the device name, size, and mount point for each device.

This will print only the specified columns. 

This will hide column headings. 

lsblk -dn

lsblk --help 

This will display the help section of the command.

In this article we discussed the 'lsblk' command which is a vital tool for managing storage devices in Linux, offering detailed insights into hard drives and SSDs. This article covers its syntax, options, and practical applications. 'lsblk', part of the util-Linux package, efficiently queries system files to present a tree-like view of block devices. Examples demonstrate how to list devices, customize output, and visualize storage efficiently. Mastering 'lsblk' enhances system administration, allowing users to navigate and manage storage resources effectively.

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