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Example of Context Sensitive Help 
 
The following example illustrates how the context-sensitive help feature creates an access list from the 
configuration mode.  
 
Enter the letters “co” at the system prompt followed by a question mark (?). Do not leave a space between 
the last letter and the question mark (?). The system provides the commands that begin with co.  
 
Router# co? 
  configure  Enter configuration mode 
  copy       Copy from one file to another 
Router# co 
  
Enter the configure command followed by a space and a question mark (?) to list the command's keyword(s) 
and a brief explanation: 
 
Router# configure ? 
  terminal  Configure from the terminal

 

 
Note that in the example below, if you enter the configure command followed by the Carriage Return (Enter 
or Return key), you will be prompted that the command is incomplete. 
 
Router# configure 
% Command incomplete. 
Router# 
 
Generally, uppercase letters represent variables. For example, after entering a command, such as 
hostname, and using a space and a question mark, you will be prompted for the new name, represented by 
WORD. In cases where an IP address is the variable, the uppercase letters A.B.C.D will represent it. 
 
Router(config)# hostname ? 
  WORD  This system's network name

 

 
In this access list example below, there are two further options listed after the question mark. The user may 
enter a source wildcard, or the command is complete as it is already entered. The carriage return symbol 
(<cr>) indicates a carriage return is needed to enter the command. More information on access lists is found 
in Chapter 5. 
 
Router(config)# access-list 99 deny 192.168.123.0 ? 
  A.B.C.D Source wildcard. e.g. 0.0.0.255 
  <cr> 
Router(config)# access-list 99 deny 192.168.123.0 
 

 
The CLI user interface provides an error indicator, a caret symbol (^). The caret symbol appears at the point 
in the command string where you have entered an incorrect letter, command, keyword, or argument.  
 
In the following example, suppose you want to enable rip router: 
 
Router(config)# routed rip 
 

         

 ^ 

  % Invalid input detected at '^' marker.

 

 
There is no command starting with routed, so the first invalid input is ‘d’. Hence, the indicated caret symbol 
(^)marks the invalid input. 
 
Router(config)# route 
 % Ambiguous command. 
Router(config)#