Processes

ps
Shows the process status of your processes.

ps aux
Shows all of the processes in detail.

top
Shows the "top" processes in full-screen mode, refreshed every second. There is also summary information at the top in terms of memory usage, CPU utilization, load averages, and system uptime.

kill (process id)
Requests that the process terminate. (This sends a TERM signal.) If the process does not terminate, follow-up with the larger hammer shown below.

kill -9 (process id)
This sends a non-blockable KILL signal to the process. You may need to sudo kill if you do not own the process.