Cisco IOS XE, Configuration Manual, Page: 19 / 358

Using the Command-Line Interface in Cisco IOS XE Software
Using the CLI
v
EXEC commands are not saved when the software reboots. Commands that you issue in a configuration
mode can be saved to the startup configuration. If you save the running configuration to the startup
configuration, these commands will execute when the software is rebooted. Global configuration mode
is the highest level of configuration mode. From global configuration mode, you can enter a variety of
other configuration modes, including protocol-specific modes.
ROM monitor mode is a separate mode that is used when the software cannot load properly. If a valid
software image is not found when the software boots or if the configuration file is corrupted at startup,
the software might enter ROM monitor mode. Use the question symbol (?) to view the commands that
you can use while the device is in ROM monitor mode.
rommon 1 > ?
alias set and display aliases command
boot boot up an external process
confreg configuration register utility
cont continue executing a downloaded image
context display the context of a loaded image
cookie display contents of cookie PROM in hex
.
.
.
rommon 2 >
The following example shows how the command prompt changes to indicate a different command mode:
Router> enable
Router# configure terminal
Router(config)# interface ethernet 1/1
Router(config-if)# ethernet
Router(config-line)# exit
Router(config)# end
Router#
Note
A keyboard alternative to the end command is Ctrl-Z.
Using the Interactive Help Feature
The CLI includes an interactive Help feature. Table 2 describes how to use the Help feature.
Table 2 CLI Interactive Help Commands
Command Purpose
help Provides a brief description of the Help feature in any command mode.
? Lists all commands available for a particular command mode.
partial command? Provides a list of commands that begin with the character string (no
space between the command and the question mark).
partial command<Tab> Completes a partial command name (no space between the command
and <Tab>).
command ? Lists the keywords, arguments, or both associated with the command
(space between the command and the question mark).
command keyword ? Lists the arguments that are associated with the keyword (space between
the keyword and the question mark).