Which command lists all currently running processes?

The command that lists all currently running processes is commonly known as "ps" which stands for "process status." The "ps" command can display a snapshot of current processes along with their PID (Process ID), user, and CPU/memory usage, among other details. By default, it shows processes for the current shell session, but when used with certain options (like "ps -e" or "ps aux"), it can show all processes running on the system.

While "top" provides a dynamic, real-time view of running processes and can be useful for monitoring system status, it is primarily designed for performance tracking rather than simply listing all current processes. "htop" is similar to "top" but offers a more interactive experience with additional features such as process management; however, it too does not simply "list all processes" like "ps" does. The "jobs" command is limited to displaying the background jobs running in the current shell session and does not provide a comprehensive list of all system processes.

Thus, in this context, "ps" is the most appropriate command for listing currently running processes.