How to Correctly Check if a Process is running and Stop it

Question

What is the correct way of determining if a process is running, for example FireFox, and stopping it?

I did some looking around and the best way I found was this:

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Answer 1

If you don't need to display exact result "running" / "not runnuning", you could simply:

ps notepad -ErrorAction SilentlyContinue | kill -PassThru

If the process was not running, you'll get no results. If it was running, you'll receive get-process output, and the process will be stopped.