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Using the Command-Line Interface
This section contains the following topics:
■ CLI Command Hierarchy on page 91
■ Starting the CLI on page 92
■ CLI Operational Mode on page 92
■ CLI Configuration Mode on page 93
■ CLI Basics on page 94
For more information about the CLI, see the JUNOS CLI User Guide.
CLI Command Hierarchy
The CLI commands are organized hierarchically, with commands that perform a
similar function grouped together under the same level. For example, all commands
that display information about the Services Router system and system software are
grouped under the show command, and all commands that display information about
the routing table are grouped under the show route command. Figure 53 on page
91 illustrates a portion of the show command hierarchy.
Figure 53: CLI Command Hierarchy Example
To execute a command, you enter the full command name, starting at the top level
of the hierarchy. For example, to display a brief view of the routes in the routing
table, use the command show route brief.
The hierarchical organization results in commands that have a regular syntax and
provides the following features that simplify CLI use:
■ Consistent command names—Commands that provide the same type of function
have the same name, regardless of the portion of the software they are operating
on. For example, all show commands display software information and statistics,
and all clear commands erase various types of system information.
■ Lists and short descriptions of available commands—Information about available
commands is provided at each level of the CLI command hierarchy. If you type
a question mark (?) at any level, you see a list of the available commands along
with a short description of each command.
■ Command completion—Command completion for command names (keywords)
and command options is also available at each level of the hierarchy. If you type
a partial command name followed immediately by a question mark (with no
Using the Command-Line Interface ■ 91
Chapter 4: Services Router User Interface Overview