CHAPTER
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Cisco MWR 1900 Mobile Wireless Edge Router Software Configuration Guide
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Cisco IOS Software Basics
This chapter describes what you need to know about the Cisco IOS software before you configure the
router using the command-line interface (CLI). This chapter includes the following:
•Getting Help, page 3-1
•Understanding Command Modes, page 3-2
•Undoing a Command or Feature, page 3-3
•Saving Configuration Changes, page 3-3
•Where to Go Next, page 3-3
Understanding these concepts will save time as you begin to use the CLI. If you have never used the
Cisco IOS software or need a refresher, take a few minutes to read this chapter before you proceed to
the next chapter.
If you are already familiar with the Cisco IOS software, proceed to Chapter4, “Configuring with the
Command-Line Interface.”

Getting Help

Use the question mark (?) and arrow keys to help yo u enter commands:
•For a list of available commands, enter a question mark:
Router> ?
•To complete a command, enter a few known characters followed by a question mark (with no space):
Router> s?
•For a list of command variables, enter the command followed by a space and a question mark:
Router> show ?
•To redisplay a command you previously entered, press the up arrow key. You can continue to press
the up arrow key for more commands.