Help Facilities of the Cisco IOS CLI
Cisco IOS Software uses several command-line input help facilities, including context-sensitive
help. The following list provides details about the different help facilities of the Cisco IOS CLI.
?– Context-sensitive help: Provides a list of commands and the arguments associated with a
speci?¬?c command.
?– Console error messages: Identi?¬?es problems with any Cisco IOS commands that are
incorrectly entered so that you can alter or correct them.
?– Command history buffer: Allows recall of long or complex commands or entries for reentry,
review, or corrections.
Context-sensitive help eliminates the need for memorization of Cisco IOS commands. At any time
during an EXEC session, you can enter a question mark (?) to get help. The following two types
of context-sensitive help are available:
?– Word help: Enter the ? command to get word help for a list of commands that begin with a
particular character sequence. Enter the character sequence followed immediately by the
question mark. Do not include a space before the question mark. The router displays a list of
commands that begin with the characters you entered.
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