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In the example above, a command has been issued that is unknown or ambiguous.
Router(config)# router
% Command incomplete.
Router(config)#
In the example above a command has been issued that is incomplete. In the following examples, various
correct commands (using route) are displayed.
Router(config)# route?
route-map Create route-map or enter route-map command mode
router Enable a routing process
Router(config)# route
Router(config)# router ?
ospf Open Shortest Path First
rip Routing Information Protocol (RIP)
Router(config)# router
Router(config)#router rip
Router(config-rip-router)#
3.6 Using CLI Command History
The CLI user interface provides a history or record of commands that you have entered. This feature is
particularly useful for recalling long or complex commands or entries, including access lists. To recall
commands from the history buffer, use one of the following commands:
Command Purpose
Press Ctrl-P or the up arrow
key
Recall commands in the history buffer, beginning with
the most recent command. Repeat the key sequence
to recall successively older commands.
Press Ctrl-N or the down arrow
key
Return to more recent commands in the history buffer
after recalling commands with Ctrl-P or the up arrow
key. Repeat the key sequence to recall successively
more recent commands.
show history
While in EXEC mode, list the last several commands
entered.
3.7 Using the No and Default Forms of Commands
Almost every router configuration command has an opposite no form that negates or reverses a command.
In general, the no form is used to disable a function that has been enabled. To re-enable a disabled
function, or to enable a function that is disabled by default, use the command without the no keyword. For
example, Address Resolution Protocol (ARP) is enabled by default. Specify the command no arp to disable
the ARP table; to re-enable the ARP table, use the arp command.
3.8 Using Command-Line Editing Features and Shortcuts
There are a variety of shortcuts and editing features enabled for the CLI command-line interface. The
following subsections describe these features:
• Moving Around on the Command Line
• Completing a Partial Command Name