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Getting Started with the JUNOS Command-Line Interface

As an introduction to the JUNOS command-line interface (CLI), this topic provides instructions for simple steps you take after installing the JUNOS software 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.

Note: 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 JUNOS devices.

Before You Begin

Make sure your device hardware is set up and the JUNOS software 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.

Logging On to a JUNOS Device

Log in as root.
The root login account has superuser privileges, with access to all commands and statements.
Start the CLI:root# cli root@>
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 Release 7.6 software (or a later release), 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.

Displaying JUNOS Commands

The CLI includes several ways to get help about commands. This section shows some examples of how to get help.

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

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

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

For more information about getting help about commands and statements, see Getting Online Help.

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