A concise guide on how to view Linux block device information

Linux is an open source operating system that is widely used in the server field. Linux systems support a variety of hardware devices and provide a wealth of commands and tools to manage these devices. Among them, block devices are an important part of the Linux system and can be used to store data, such as hard drives, SSDs and other devices. This article will introduce how to quickly view block device information in a Linux system and provide specific code examples.

1. Common commands for viewing block device information

1. lsblk command: The lsblk command is used to list block device information, including device name, size, mount point, etc. You can view the block device information in the system through the following command:

lsblk

After running the above command, all block device information in the system will be listed, including device name, size, mount point and other details. .

2. fdisk command: The fdisk command is used for partition management and can also be used to view the partition status of block devices. You can view the partition information of the specified block device through the following command:

fdisk -l /dev/sda

The above command will list the partition information of the device /dev/sda, including partition number, starting sector, size, etc.

3. blkid command: The blkid command is used to display the UUID and other information of the block device. You can use the following command to view the UUID information of all block devices in the system:

blkid

The above command will list the UUID information of all block devices in the system to uniquely identify each block device.

2. Use code examples to view block device information

The following is a simple Python code example to obtain information about all block devices in the system and output it to the console:

import os

def get_block_devices():
    block_devices = []
    devices = os.listdir('/sys/block/')
    for device in devices:
        if device.startswith('sd') or device.startswith('nvme'):
            device_path = os.path.join('/sys/block/', device)
            with open(os.path.join(device_path, 'size')) as f:
                size = int(f.read().strip()) * 512 / 1024 / 1024 / 1024
            block_devices.append({'device': device, 'size': size})
    return block_devices

if __name__ == '__main__':
    block_devices = get_block_devices()
    for device in block_devices:
        print('Device: %s, Size: %.2fGB' % (device['device'], device['size']))

The above code is written in Python. It obtains the information of all block devices in the system by reading the files in the /sys/block/ directory, and outputs the device name and size information.

Through the above commands and code examples, we can quickly understand how to view block device information in Linux systems. These tools and codes can help us better manage and understand the storage devices in the system, and improve the operating efficiency and stability of the system. Hope this article helps you!

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