How to view block device information in Linux environment?

On the Linux operating system, we often need to view various hardware information for system maintenance and troubleshooting. Among them, viewing block device information is a very common operation, which can help us understand the detailed information of storage devices such as hard drives and solid-state drives. This article will introduce how to view block device information on Linux and provide specific code examples.

In Linux systems, we can use some commands to view block device information. Commonly used commands include lsblk, fdisk, blkid, etc. Below we will introduce the use of these commands one by one and give corresponding code examples.

1. lsblk command

The lsblk command can list all block device information in the system, including hard disks, partitions, mount points, etc. You can use the following command to view block device information:

lsblk

After executing the above command, information similar to the following will be output:

NAME   MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda      8:0    0  100G  0 disk 
├─sda1   8:1    0  500M  0 part /boot
└─sda2   8:2    0 99.5G  0 part /

In the above example, sda represents the hard disk device, sda1 and sda2 Represents two partitions on the hard disk, and also displays information such as their respective mount points.

2. fdisk command

The fdisk command can be used to display disk partition table information. You can use the following command to view the partition information of the specified hard disk (such as /dev/sda):

fdisk -l /dev/sda

After executing the above command, the partition information of the specified hard disk will be output, including partition number, starting sector, and ending sector. Area, partition size and other details.

3. blkid command

blkid command can be used to display the UUID and file system type of the block device. You can use the following command to view the UUID (such as /dev/sda1) and file system type of the specified device:

blkid /dev/sda1

After executing the above command, the UUID and file system type of the specified device will be output.

The above are common methods and code examples for viewing block device information on Linux systems. Through these commands, we can quickly understand the detailed information of each block device in the system, providing help for system maintenance and troubleshooting. Hope the above content is helpful to you.

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