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1-8
C
1: U
HAPTER
SING THE
Command Language
Structure
Command Features
Command Line Edit
C
L
I
(CLI)
OMMAND
INE
NTERFACE
The CLI command language creates, manages, displays, and removes system
entities that describe system and network connections and processes. Configured
entities are stored in tables such as the IP Routing Table.
Some common entities are:
Network - defines local and remote networks, network connections, hosts
and routers
User - describes connection parameters, for operation and authorization
Filter - can be applied to interfaces, connections, and users to control access
through the system
Interface - describes physical devices; for example, ports
Syslog Hosts - receives system messages
DNS Servers - translates IP addresses to and from host names
Route - describes a path through the network to another system/network
Table entries are created with an ADD command, and removed with a DELETE
command. The ADD command specifies the most important parameters of the
entry. Additional parameters are usually specified with the SET command, which is
also used to change configured parameters.
SHOW commands display detailed information about a specific table entry or a
set of scalars (non-table items). For example, show ip settings displays
system-wide IP information. SHOW ALL commands display information. The
show all commands display all parameters for all entries in tables associated with
particular commands.
The order of items in a table is usually not relevant, nor is it inherent in the type of
entity. Sometimes the order is relevant, though, and you must specify a preference
value in the ADD command, indicating where this item belongs in the table. For
example, add dns server <server_name> preference 1 assigns a priority of 1 to
this DNS server. The DNS server with the highest preference number will be used
first.
The command language has several built-in features that make it easier to use.
When abbreviating commands, it's sometimes difficult to remember commands
and their syntax. Using command completion and positional help aids in jogging
your memory of the commands and their parameters, while you are typing in a
command string.
Command line edit allows non-destructive cursor movements on a command
already typed. The Command line editing commands are listed in the following
table.
(Ctrl b) or left arrow
(Ctrl f) or right arrow
(Esc b)
(Esc f)
(Ctrl a)
go back one character
go forward one character
go back one word
go forward one word
go to beginning of command
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