Introducing the CLI

The JUNOS command-line interface (CLI) is the software interface you use to access the router—whether from the console or through a network connection. This chapter provides an overview of the JUNOS CLI.

The JUNOS CLI is a Juniper Networks-specific command shell that runs on top of a UNIX-based operating system kernel. By leveraging industry-standard tools and utilities, the CLI provides a powerful set of commands you can use to monitor and configure a router. (See Figure 1.)

The CLI is a straightforward command interface. You type commands on a single line, and the commands are executed when you press the Enter key. The CLI provides command help and command completion, and it also provides Emacs-style keyboard sequences that allow you to move around on a command line and scroll through recently executed commands.

Topics in this chapter include:

• Understanding CLI Command Modes
• Understanding Command and Statement Hierarchies
• Key Features of the CLI
• Leveraging Industry-Standard Technologies
• Other Tools to Configure and Monitor JUNOS Routers
• Commands and Configuration Statements for JUNOS-FIPS