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Cisco Secure Router 520 Series Software Configuration Guide
OL-14210-01
Appendix A Cisco IOS Software Basic Skills
Saving Configuration Changes
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-3 lists some error messages that you might encounter while using the CLI to configure your
router.
Saving Configuration Changes
You need to enter the copy running-config startup-config command to save your configuration changes
to nonvolatile RAM (NVRAM) so that they are not lost if there is a system reload or power outage. This
example shows how to use this command to save your changes:
Router# copy running-config startup-config
Destination filename [startup-config]?
Ta ble A-3 Common CLI Error Messages
Error Message Meaning How to Get Help
% Ambiguous command:
"show con”
You did not enter enough
characters for your router to
recognize the command.
Reenter the command, followed
by a question mark (?) with no
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
keywords or values required by
this command.
Reenter the command, followed
by a question mark (?) with no
space between the command and
the question mark.
The possible keywords that you
can enter with the command are
displayed.
% Invalid input detected at
‘^’ marker.
You entered the command
incorrectly. The error occurred
where the caret mark (^) appears.
Enter a question mark (?) to
display all of the commands that
are available in this particular
command mode.