What does the 'ps aux' command display?

The 'ps aux' command is used in Linux to display a detailed list of all currently running processes on the system. When executed, it provides information such as the process ID (PID), the user who owns the process, the CPU and memory usage, the running time of the process, and the command that initiated the process. This command is particularly useful for system monitoring and troubleshooting, as it allows users to see what's running at any given time, including processes from all users on the system.

The other options do not accurately describe what 'ps aux' provides. System memory usage pertains to commands like 'free' or 'top', which show RAM and swap usage. Disk space details would be revealed through commands such as 'df' or 'du' that specifically report on file system usage. A list of users logged in can be generated using the 'who' or 'w' commands, which focus strictly on user sessions rather than active processes.