
Appendix A Cisco IOS Software Basic Skills
Using Commands
Using Commands
This section provides some tips about entering Cisco IOS commands at the
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 that you entered, you can enter the keyword no before most commands; for example, no ip routing.
Command-Line Error Messages
Table
Table | Common CLI Error Messages |
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Error Message |
| Meaning | How to Get Help |
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% Ambiguous command: | You did not enter enough | ||
"show con" |
| characters for your router to | by a question mark (?) with no |
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| recognize the command. | space between the command and |
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| the question mark. |
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| The possible keywords that you |
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| can enter with the command are |
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| displayed. |
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% Incomplete command. | You did not enter all the | ||
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| keywords or values required by | by a question mark (?) with no |
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| this command. | space between the command and |
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| the question mark. |
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| The possible keywords that you |
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| can enter with the command are |
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| displayed. |
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% Invalid input detected at | You entered the command | Enter a question mark (?) to | |
‘^’ marker. |
| incorrectly. The error occurred | display all the commands that |
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| where the caret mark (^) appears. | are available in this particular |
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| command mode. |
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Cisco 819 Integrated Services Routers Software Configuration Guide
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