Function and Usage: The role of df command in Linux system

The df command in Linux is a very useful tool for viewing file system usage. Through the df command, we can quickly understand the allocation, usage and remaining space of disk space.

The basic syntax of the df command is as follows:

df [选项] [文件|目录]

Here are some common options:

• -h: Display disk usage in an easy-to-read format, with KB, MB, GB and other units are displayed;
• -T: Display the file system type;
• -i: Display the inode usage;
• -x: Exclude the specified type file system;
• -a: displays all file systems, including system-specific file systems;
• -l: displays only local file systems.

The following uses some specific code examples to demonstrate how to use the df command.

Example 1: View the disk usage of the entire system

$ df -h

This command will display the usage of each file system in the entire system, including file system type, size, used space, and available space , usage and mount points, etc.

Example 2: Check the disk usage of the specified directory

$ df -h /root

This command will display the usage of the file system where the specified directory (here is the /root directory) is located.

Example 3: Display only the disk usage of the local file system

$ df -l

This command will only display the usage of the local file system, excluding network file systems and special file systems.

Example 4: Display the file system usage in inode units

$ df -i

This command will display the inode usage of the file system, including the total number of inodes, the number of used inodes and the number of remaining inodes wait.

Example 5: Exclude the specified type of file system

$ df -x tmpfs

This command will exclude the tmpfs type file system and only display the usage of other types of file systems.

Through the above examples, we can better understand the use and function of the df command. Through the df command, we can quickly understand the allocation and usage of disk space, which provides convenience for us to manage disk space. At the same time, the df command also helps us discover the problem of insufficient disk space in time so that we can handle and adjust accordingly.

In summary, the df command plays an important role in the Linux system. Through it, we can easily check the usage of disk space and help us manage and optimize disk space.

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