What does the 'df' command report?

The 'df' command is specifically designed to report disk space usage of file systems in Linux and other Unix-like operating systems. When executed, it provides a summary of available and used disk space for all mounted file systems. This includes details such as the total size of the file system, how much space is used, how much is free, and the percentage of space that is currently utilized.

Understanding this command is crucial for system administration, as it helps in monitoring disk usage, ensuring that there is enough space for files and applications, and managing disk resources effectively. The output typically includes information about different file systems such as their mount points and size distributions, which can be vital for preventing disk overflow and maintaining system performance.

Other commands may be used for tasks related to system uptime and load, memory usage, or network connections, but those functions fall outside the scope of what 'df' provides.