What does the df command display?

The df command provides information about disk space usage on mounted filesystems, showing details such as total disk space, used space, available space, and the filesystem's mount point. This command is especially useful for monitoring disk usage and ensuring that the filesystems do not run out of space. Users can see how much space is consumed by files and directories on different mounts, helping to manage storage resources effectively.

Other options do not align with the function of the df command. For example, a list of running processes is displayed by the ps command, not df, and network configuration settings can be viewed using commands like ifconfig or ip. System memory usage would be checked with commands such as free or top. Each of these tools serves a specific purpose in monitoring and managing different aspects of the Linux operating system.