- The Cisco IOS—Basic Router Commands
- Log In on the Console
- Entering the Privileged Mode
- Router Mode Summary
- The IOS Help Facility
- Command History and Editing Features
- The show Command
- Router Memory Types
- Examining RAM, NVRAM, and Flash RAM
- The Cisco Discovery Protocol
- More About show
- Objective 11: Telnet
- Practice
- Help System
Command History and Editing Features
The IOS also provides you with some shortcuts related to entering commands at the EXEC prompt. One method is to abbreviate commands; for example, sh for the command show. A very quick way to enter a previously used command is to use the Command History. The Command History provides you with a list of your most recently used commands (the last 10 commands). To cycle through the commands (most recent to least recent) press the up-arrow key (the down-arrow key moves you in the opposite direction through the list). You can view a list of the commands in the History buffer using the command show history.
You can change the number of commands that are available in the Command History buffer. Use the terminal history size [number] command, where the number is the number of commands you want to be saved in the Command History. This command must be used at the privileged prompt (see the following figure).
){kind=link}
The IOS also provides several editing commands that can be used to edit or modify a command at the EXEC prompt. Table 3.2 summarizes these editing commands.
Table 3.2 IOS Editing Commands
|
Command Keys |
Result |
|
Ctrl+A |
Moves the cursor to the beginning of the command line |
|
Ctrl+E |
Moves the cursor to the end of the command line |
|
Esc+F |
Moves the cursor forward one word on the command line |
|
Esc+B |
Moves the cursor back one word on the command line |
|
Backspace |
Moves back one character on the command line, deleting the character to the left of the cursor |
|
Ctrl+F |
Moves forward one character from the cursor |
|
Ctrl+B |
Moves backward one character from the cursor |
|
Command abbreviation followed by Tab |
Completes the abbreviated command (sh becomes show) |
|
Ctrl+P |
Same as the up arrow, shows most recent command in History |
|
Ctrl+N |
Same as down arrow, moves backward through the History |
These command-line editing shortcuts are enabled on a router by default. They can be disabled using the command terminal no editing (executed at the privileged prompt). If you find that you can use these editing shortcuts, though, you can enable them by executing the terminal editing command at the privileged prompt.