Cisco Systems OL-6426-02 manual Using Commands, Abbreviating Commands, Undoing Commands

Appendix A Cisco IOS Software Basic Skills

Using Commands

Using Commands

This section provides some tips about entering Cisco IOS commands at the command-line interface (CLI).

Abbreviating Commands

You only have to enter enough characters for the router to recognize the command as unique. This example shows how to enter the show version command:

Router # sh v

Undoing Commands

If you want to disable a feature or undo a command you entered, you can enter the keyword no before most commands; for example, no ip routing.

Command-Line Error Messages

Table A-3lists some error messages that you might encounter while using the CLI to configure your router.

Table A-3	Common CLI Error Messages
Error Message		Meaning	How to Get Help
% Ambiguous command:		You did not enter enough	Reenter the command, followed
"show con"		characters for your router to	by a question mark (?) with no
		recognize the command.	space between the command and
			the question mark.
			The possible keywords that you
			can enter with the command are
			displayed.
% Incomplete command.		You did not enter all of the	Reenter the command, followed
		keywords or values required by	by a question mark (?) with no
		this command.	space between the command and
			the question mark.
			The possible keywords that you
			can enter with the command are
			displayed.
% Invalid input detected at		You entered the command	Enter a question mark (?) to
‘^’ marker.		incorrectly. The error occurred	display all of the commands that
		where the caret mark (^) appears.	are available in this
			command mode.

Cisco 1800 Series Integrated Services Routers (Fixed) Software Configuration Guide

A-6 OL-6426-02