Processus

• top
  See process that use most ressources. View updated dinamically. To kill on process don't need to exit top, but just type k

• killall
  Allow to kill all the process by name
  killall chrome

• Launch a command in background
  Allow you not to have to wait when a command in long, or when it's a soft that is independant of the terminal add a & at the end of the command like
  sublime& To open the sublime text editor But when the terminal shell (tab) is closed, the process launched is also closed

• chkconfig Manage services

// List all services and their current state    
chkconfig