Which command allows a user to view the system resources being used in real-time?

The command that allows a user to view system resources being used in real-time is the "top" command. This command provides a dynamic, real-time view of the system’s processes and resource usage, including CPU and memory utilization.

When you run the "top" command, it provides a continually updated list of processes, displaying statistics such as CPU load, memory usage, and process IDs. This real-time display helps administrators and users to monitor system performance and identify processes that are consuming significant resources.

The other commands serve different purposes:

• "df" displays information about disk space usage on mounted filesystems but does not provide real-time monitoring of resource usage.

• "ps -aux" shows a snapshot of running processes and their resource utilization at the moment the command is executed, but it does not update continuously like "top."

• "ifconfig" is used for network interface configuration, showing network-related information, but it does not deal with overall system resource usage.

Therefore, the functionality provided by the "top" command specifically caters to the need for real-time monitoring of system resources.