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Getting Started with the Junos OS Command-Line Interface

As an introduction to the Junos OS command-line interface (CLI), this topic provides instructions for simple steps you take after installing Junos OS on the device. It shows you how to start the CLI, view the command hierarchy, and make small configuration changes. The related topics listed at the end of this topic provide you more detailed information about using the CLI.

The instructions and examples in this topic are based on sample M Series and T Series routers. You can use them as a guideline for entering commands on your devices running Junos OS. Before you begin, make sure your device hardware is set up and Junos OS is installed. You must have a direct console connection to the device or network access using SSH or Telnet. If your device is not set up, follow the installation instructions provided with the device before proceeding.

1. Log in as root.

   The root login account has superuser privileges, with access to all commands and statements.

2. Start the CLI:
   root# cliroot@>

   The > command prompt shows you are in operational mode. Later, when you enter configuration mode, the prompt will change to #.

Note: If you are using the root account for the first time on the device, remember that the device ships with no password required for root, but the first time you commit a configuration with Junos OS Release 7.6 or later, you must set a root password. Root access is not allowed over a telnet session. To enable root access over an SSH connection, you must configure the system services ssh root-login allow statement.

1. Type ? to show the top-level commands available in operational mode.
   root@> ?

   Possible completions:
       clear           Clear information in the system
       configure       Manipulate software configuration information
       diagnose        Invoke diagnose script
       file            Perform file operations
       help            Provide help information
       monitor         Show real-time debugging information
       mtrace          Trace multicast path from source to receiver
       ping            Ping remote target
       quit            Exit the management session
       request         Make system-level requests
       restart         Restart software process
       set             Set CLI properties, date/time, craft interface message
       show            Show system information
       ssh             Start secure shell on another host
       start           Start shell
       telnet          Telnet to another host
       test            Perform diagnostic debugging
       traceroute      Trace route to remote host
   

2. Type file ? to show all possible completions for the file command.
   root@> file ?

            
   Possible completions:
       <[Enter]>            Execute this command
       archive              Archives files from the system
       checksum             Calculate file checksum
       compare              Compare files
       copy                 Copy files (local or remote)
       delete               Delete files from the system
       list                 List file information
       rename               Rename files
       show                 Show file contents
       source-address       Local address to use in originating the connection
       |                    Pipe through a command
   

3. Type file archive ? to show all possible completions for the file archive command.
   root@> file archive ?

   Possible completions:
       compress             Compresses the archived file using GNU gzip (.tgz)
       destination          Name of created archive (URL, local, remote, or floppy)
       source               Path of directory to archive