The ps command lists running processes. The following command lists all processes running on your system:

ps -A

If this is too many processes to read at one time, you can pipe the output through the less command to scroll through them at your own pace:

ps -A | less

You could also pipe the output through grep to search for a specific process without using any other commands. The following command would search for the Firefox process:

ps -A | grep firefox

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