The following commands and utilities used for managing processes:
processes - What are processes?

ps - Get a listing of processes on the system.
pstree - Get a listing of processes and their parents.
top - See which processes are using the most CPU time.

jobs - Show what processes you have in the background.
stop - Stop a process that is running in the background.
fg - Bring a background process to the foreground.
bg - Make a stopped process run in the background.

kill - Kill a process by PID number.
killall - Kill a process by process name.