62 Using the CLI
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Terminal Command Buffer
Every time a command is entered in the CLI, it is recorded on an internally managed Command
History buffer. Commands stored in the buffer are maintained on a
First In First Out (FIFO)
basis.These commands can be recalled, reviewed, modified, and reissued. This buffer is not
preserved across device resets.
By default, the history buffer system is enabled, but it can be disabled at any time. For information
about the command syntax to enable or disable the history buffer, see history.
There is a standard default number of commands that are stored in the buffer. The standard
number of 10 commands can be increased to 256. By configuring 0, the effect is the same as
disabling the history buffer system. For information about the command syntax for configuring the
command history buffer, see history size.
To display the history buffer, see show history.
Negating the Effect of Commands
For many configuration commands, the prefix keyword "
no
" can be entered to cancel the effect of a
command or reset the configuration to the default value. This guide describes the negation effect
for all applicable commands.
Command Completion
If the command entered is incomplete, invalid, or has missing or invalid parameters, then the
appropriate error message is displayed. This assists in entering the correct command. By pressing
the <Tab> button, an incomplete command is entered. If the characters already entered are not
enough for the system to identify a single matching command, press "?" to display the available
commands matching the characters already entered.
Incorrect or incomplete commands are automatically re-entered next to the cursor. If a parameter
must be added, the parameter can be added to the basic command already displayed next to the
cursor. The following example indicates that the command interface ethernet requires a missing
parameter.
Keyword Source or destination
Up-arrow key
Ctrl+P
Recalls commands in the history buffer, beginning with the most recent
command. Repeats the key sequence to recall successively older
commands.
Down-arrow key Returns to more recent commands in the history buffer after recalling
commands with the up-arrow key. Repeating the key sequence will recall
successively more recent commands.
(config)#interface ethernet
%missing mandatory parameter
(config)#interface ethernet
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