How can I check the disk usage in Linux?

In Linux systems, you can use the following command to check the file usage:

1. The df command is used to display the overall disk usage of the file system, including information such as the total size, used space, available space, and mounting points.
2. Show me the disk usage in human-readable format.
3. du command: used to display the disk usage of directories or files.
4. Show the disk usage of the specified directory or file.
5. lsof command: used to display a list of files currently open in the system, allowing you to see which processes are using a particular file.
6. List open files for the specified file path
7. The fuser command shows which process is using a file and can determine if a file is being held by a process.
8. List processes that are currently using the specified file.
9. The commands lsof and fuser can also be used together to view the occupation status of all files in a certain directory.
10. For each file in the specified directory path, execute either lsof or fuser command.

The above command can be selected as needed to view the occupancy status of the file according to different situations.