Cisco Systems A9KMOD80TR Using the Question Mark ? to Display On-Screen Command Help, characters

Chapter 5 CLI Tips, Techniques, and Shortcuts

CLI Tips and Shortcuts

F I N A L D R A F T — C i s c o C o n f i d e n t i a l

Using the Question Mark (?) to Display On-Screen Command Help

Use the question mark (?) to learn what commands are available and the correct syntax for a command. Table 5-1summarizes the options for on-screen help.

Tip The space (or no space) before the question mark (?) is significant. If you include a space before the question mark, the system displays all available options for a command or CLI mode. If you do not include a space, the system displays a list of commands that begin with a particular character string.

Table 5-1 On-Screen Help Commands

	Command		Description
	partial-command?		Type a question mark (?) at the end of a partial command to list the commands that begin with those
			characters.
			RP/0/RSP0/CPU0:router# co?
			configure copy
			Note Do not include a space between the command and question mark.
?			Lists all commands available for a particular command mode.
	command ?		Include a space before the question mark (?) to list the keywords and arguments that belong to a
			command.
			RP/0/RSP0/CPU0:router# configure ?
			exclusive	Configure exclusively from this terminal
			terminal	Configure from the terminal
			<cr>
			Note For most commands, the <cr> symbol indicates that you can execute the command with the
			syntax already entered. For the preceding example, press Enter to enter global configuration
			mode.
	command keyword ?		Type a question mark (?) after the keyword to list the next available syntax option for the command.
			RP/0/RSP0/CPU0:router# show aaa ?
			taskgroup	Show all the local taskgroups configured in the system
			userdb	Show all local users with the usergroups each belong to
			usergroup	Show all the local usergroups configured in the system
			Note Include a space between the keyword and question mark.
			The following example shows how to add an entry to access list 99. The added entry denies access to all
			hosts on subnet 172.0.0.0 and ignores bits for IPv4 addresses that start within the range of 0 to 255. The
			following steps provide an example of on-screen command help:
		Step 1	Type the access-listcommand, followed by a space and a question mark, to list the available options for
			the command:
			RP/0/RSP0/CPU0:router(config)# ipv4 access-list ?
			log-update	Control access lists log updates
			maximum	Out of resources configration
			WORD	Access list name - maximum 32 characters
		Cisco ASR 9000 Series Aggregation Services Router Getting Started Guide
	5-2			OL-17502-01