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Typing a question mark (?)
at the user EXEC mode prompt or the privileged EXEC mode prompt
displays a handy list of available commands.
Notice the "--More--"
at the bottom of the sample display. The screen displays many lines at
one time. The "--More--"
prompt at the bottom of the display indicates that multiple screens
are available as output. Whenever a "--More--"
prompt appears, the next available screen can be viewed by pressing
the space bar. To display just the next line, press the Return or
Enter key. Press any other key to return to the prompt.
To access privileged EXEC mode, type
enable
or the abbreviation ena.
This might cause the router to prompt the user for a password if one
has been set. If a "?"
(question mark) is typed at the privileged EXEC mode prompt, the
screen displays a longer list of commands than is available at the
user EXEC mode prompt.
Screen output varies, depending on
Cisco IOS software level and router configuration.
If a user wants to set the router clock
but does not know the necessary command, the help function can be used
to check for the correct command.
The following exercise illustrates one of the many uses of the help
function.
The task is to set the router clock.
Assuming the command is not known, proceed using the following steps:
- Use
?
to find the command for setting the clock. The help output shows
that the clock
command is required.
- Check the syntax for changing the
time.
- Enter the current time by using
hours, minutes, and seconds, as shown in Figure
 . The system indicates that
additional information needs to be provided to complete the command.
- Press Ctrl-P
(or the up arrow) to repeat the previous command entry
automatically. Then add a space and a question mark (?)
to reveal the additional arguments. Now the command entry can be
completed.
- The caret symbol (^) and help
response indicate an error. The placement of the caret symbol shows
where the possible problem is located. To input the correct syntax,
re-enter the command up to the point where the caret symbol is
located and then enter a question mark (?).
- Enter the year, using the correct
syntax, and press Return or Enter to execute the command.
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Lab Activity
e-Lab Activity: Keyboard help in the CLI
This purpose of this lab is to learn
the help system in the Cisco IOS.
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Lab Activity
e-Lab Activity: IOS Auto-Completion
This purpose of this lab is to learn
use the router auto-completion feature (TAB key) and the history
buffer.
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