CISCO IOS
 
 
- the command are automatically interpreted by the user interface.
- 
Routeur-t2>show version
 
- You can abbreviate  the commands
 Routeur-t2>sh ver
- help available at any level
 E.g.: routeur>?
- Access command history trough direction key on your keyboard (up and down) –show history to see what is in the buffer
- Filter the output of command 
 ex: routeur>sh ver |include
 exclude
 begin key