Chapter 2
| Using the Command Line Interface
Entering Commands
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Partial Keyword
Lookup
If you terminate a partial keyword with a question mark, alternatives that
match the initial letters are provided. (Remember not to leave a space
between the command and question mark.) For example “
s?
” shows all the
keywords starting with “s.”
Console#show s?
sflow snmp snmp-server sntp spanning-tree
ssh startup-config system
Console#show s
Negating the Effect
of Commands
For many configuration commands you can enter the prefix keyword “
no
” to
cancel the effect of a command or reset the configuration to the default value.
For example, the
logging
command will log system messages to a host
server. To disable logging, specify the
no logging
command. This guide
describes the negation effect for all applicable commands.
Using Command
History
The CLI maintains a history of commands that have been entered. You can
scroll back through the history of commands by pressing the up arrow key.
Any command displayed in the history list can be executed again, or first
modified and then executed.
Using the
show history
command displays a longer list of recently executed
commands.
Understanding
Command Modes
The command set is divided into Exec and Configuration classes. Exec
commands generally display information on system status or clear statistical
counters. Configuration commands, on the other hand, modify interface
parameters or enable certain switching functions. These classes are further
divided into different modes. Available commands depend on the selected
mode. You can always enter a question mark “
?
” at the prompt to display a list
of the commands available for the current mode. The command classes and
associated modes are displayed in the following table:
