Using the Question Mark for Help

The following output shows you how using the question mark can help you to work your way through a command and all of its parameters.

Router#?	Lists all commands available in the current command mode
Router#c? clear clock	Lists all the possible choices that start with c
Router#cl? clear clock	Lists all the possible choices that start with cl
Router#clock
% Incomplete Command	Tells you that there are more parameters that need to be entered
Router#clock ? set	Shows all subcommands for this command. Sets the time and date
Router#clock set 19:50:00 14 July 2003 ?	Pressing the key confirms the time and date configured
Router#	No Error message/Incomplete Command message means the command was entered successfully