Use ps When
You want a quick scriptable process snapshot.
You are grepping for a specific process or extracting process metadata once.
Compare
ps vs top
When a snapshot of process state is enough and when you need a live process view.
`ps` gives you a point-in-time snapshot of processes. `top` gives you a live updating view that is better for ongoing inspection of CPU, memory, and process churn.
Use top When
You are watching a system under load or tracking changing process behavior.
You need live resource usage rather than a static list.
Rule of Thumb
ps snapshots. top watches live.
Want the short version? Browse the compact sheet views and save the commands you use most into a Cheatbook.