TestOut Linux Pro Practice Test 2025 - Free Linux Pro Practice Questions and Study Guide

The command that shows all running processes in Linux is "ps." This command stands for "process status" and is used to display information about active processes. When executed, it provides a snapshot of the currently running processes along with details such as process IDs (PIDs), terminal associated with each process, CPU usage, memory usage, and command line used to start the process.

While "top" is also a command for monitoring processes, it presents a dynamic, real-time view of running processes and system resource usage, updating continuously. It can be useful for ongoing monitoring but does not provide a static list like "ps." The "run" and "process" commands are not standard commands in Linux for viewing active processes, which clarifies their inapplicability in this context.

Using "ps" is fundamental in systems administration and helps users understand what processes are consuming resources and how the system is performing overall. The versatility of "ps" allows for various options to filter and format the output, making it a vital tool for managing processes in Linux.