Detailed explanation of lsblk command under Linux

The lsblk command under Linux is a powerful tool for panoramic display of disk and partition information and troubleshooting

Introduction:
In the Linux system, understanding the disk and partition information is an important part of managing and maintaining the system. In order to help us fully understand the situation of disks and partitions, and troubleshoot related problems, we can use the lsblk command. This blog will introduce the past and present, functions, usage and application scenarios of the lsblk command in detail in an easy-to-understand manner, helping readers fully understand the lsblk command and master its application in disk management and troubleshooting.

1. The past and present of the lsblk command

In early operating systems, knowing the status of disks and partitions required multiple instructions and commands to query. In order to simplify this process, the lsblk command came into being. lsblk is the abbreviation of ls block devices, which provides a simple and powerful way to display disk and partition information in the system, allowing us to quickly understand the disk layout, partition size and mounting status, etc.

2. The function and usage of the lsblk command

The lsblk command is mainly used to display information about block devices, including disks, partitions, and mount points. The following are common uses of the lsblk command:

1. Display all block device information:

lsblk

This command will display all block device information in the system, including disks and partitions.

2. Display information about a specified device:

lsblk [设备名称]

This command will display the information of the specified device, which can be the device name of a disk or partition.

3. Display the device tree structure:

lsblk -t

This command will display the hierarchical relationship of devices in a tree structure, which is convenient for us to understand the parent-child relationship between devices.

4. Display mount point information:

lsblk -m

This command will display information about the mount point, including device, mount point, and file system type.

5. Display device size units:

lsblk -o NAME,SIZE,TYPE

This command will only display the name, size and type information of the device, which is convenient for us to quickly view the basic information of the device.

3. The application scenario of the lsblk command

1. Disk layout analysis:
   By using the lsblk command, we can quickly understand the disk layout and hierarchical relationship, including disks, partitions, and logical volumes. This is very useful for analyzing disk usage and optimizing disk layout

helpful.

2. Mount point management:
   The lsblk command can display the mount point information of the device, helping us to check whether the device has been mounted, as well as the mount point and file system type. This is very handy for managing and tweaking mount points.

3. Disk capacity monitoring:
   By using the lsblk command, we can view the capacity information of the device, including the size of the disk and partition. This is very helpful for monitoring the usage of disk capacity and discovering the problem of insufficient capacity in time.

4. Troubleshoot disk problems:
   When disk-related problems occur, the lsblk command can help us quickly locate the problem, such as checking whether the device is correctly identified, whether the partition is mounted normally, and so on.

4. Common parameters and differences of lsblk command

The lsblk command has some commonly used parameters. The following are some common parameters and their functions:

• -t or –tree: Display the hierarchical relationship of devices in a tree structure.
• -m or –list: Display the information of the mount point.
• -o or --output: Specify the columns and order to be displayed, for example -o NAME, SIZE, TYPE only display name, size and type.
• -a or --all: Display all devices, including empty devices.
• -p or --paths: Display the full path of the device.

These parameters can be used in combination according to actual needs to obtain the required information.

5. Example of lsblk command

Here are some examples of common lsblk commands:

1. Display all block device information:

lsblk

2. Display information about a specified device:

lsblk /dev/sda

3. Display the device tree structure:

lsblk -t

4. Display mount point information:

lsblk -m

5. Display the name, size and type of the device:

lsblk -o NAME,SIZE,TYPE

6. Learn more about the lsblk command
If you are interested in more functions and usage of the lsblk command, you can refer to the following reference links:

• Official documentation for the lsblk command
• Detailed explanation of Linux lsblk command

The reference link provides more in-depth information and examples about the lsblk command to help you further learn and master the command.

7. Conclusion
This blog introduces the lsblk command under Linux in detail, including its past and present, functions, usage and application scenarios. As an important tool for displaying disk and partition information, the lsblk command helps us fully understand the situation of disks and partitions and solve related problems. With the support of examples and reference links, you can understand and learn the lsblk command more deeply, and improve your ability in disk management and troubleshooting.

I hope this blog can help readers better understand and apply the lsblk command, and improve work efficiency and troubleshooting capabilities in Linux systems.