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Cisco Security Appliance Command Line Configuration Guide

OL-6721-01

Appendix C Using the Command-Line Interface

Command Help

Help information is available from the command line by entering the following commands:

• help command_name

Shows help for the specific command.

• command_name ?

Shows a list of arguments available.

• string? (no space)

Lists the possible commands that start with the string.

• ? and +?

Lists all commands available. If you enter ?, the security appliance shows only commands available

for the current mode. To show all commands available, including those for lower modes, enter +?.

Note If you want to include a question mark (?) in a command string, you must press Ctrl-V before typing the

question mark so you do not inadvertently invoke CLI help.

Filtering show Command Output

You can use the vertical bar (|) with any show command and include a filter option and filtering

expression. The filtering is performed by matching each output line with a regular expression, similar to

Cisco IOS software. By selecting different filter options you can include or exclude all output that

matches the expression. You can also display all output beginning with the line that matches the

expression.

The syntax for using filtering options with the show command is as follows:

hostname# show

command

| {include | exclude | begin | grep [-v]}

regexp

In this command string, the first vertical bar (|) is the operator and must be included in the command.

This operator directs the output of the show command to the filter. In the syntax diagram, the other

vertical bars (|) indicate alternative options and are not part of the command.

The include option includes all output lines that match the regular expression. The grep option without

-v has the same effect. The exclude option excludes all output lines that match the regular expression.

The grep option with -v has the same effect. The begin option shows all the output lines starting with

the line that matches the regular expression.

Replace regexp with any Cisco IOS regular expression. See The regular expression is not enclosed in quotes

or double-quotes, so be careful with trailing white spaces, which will be taken as part of the regular

expression.

When creating regular expressions, you can use any letter or number that you want to match. In addition,

certain keyboard characters have special meaning when used in regular expressions. Table C-2 lists the

keyboard characters that have special meaning.

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