The CLI supports both command abbreviation and command completion. If the keystrokes entered are enough to match a valid command, the CLI displays the remainder of the command syntax when Tab or the spacebar is pressed. When typing a command, Tab or the spacebar invokes auto-completion. If the keystrokes entered are sufficient to identify a specific command, auto-completion completes the command. If the letters are not sufficient to identify a specific command, pressing Tab or the spacebar displays commands matching the letters entered.
The command completion functionality works for both keywords and for optional parameters that have already been configured. When using command completion for optional parameters, Tab must be used.
For example, entering ‟i <Tab> returns the following user-configured interface names:
*A:NOK-12>config>router# interface "i
"igmp_interface" "igmp_interface2" "isis_interface"
System commands are available at all CLI context levels.