du: View the disk space usage of all files and subdirectories in the current directory.du -h: View the disk space usage of all files and subdirectories in the current directory in a human-readable format.du -s: View the disk space usage of the current directory, excluding subdirectories.du -a: View the disk space usage of all files and subdirectories in the current directory, including hidden files.du -c: View the disk space usage of all files and subdirectories in the current directory and display the total size.du -d N: View the disk space usage of all files and subdirectories at a depth of N in the current directory.du -b: View the disk space usage of all files and subdirectories in the current directory in bytes.You can specify a directory to view the disk space usage of all files and subdirectories in that directory by adding the directory name after the command. For example: du /var/log.
Note that the du command will recursively calculate the size of all files and subdirectories in a directory, which may be time-consuming. If you only want to view the size of files and subdirectories in a specific directory, it is recommended to use the -d parameter to limit the depth and improve the command execution efficiency.