If you specify Administration Command-Line Interface in the component selection portion of the installation, just the command-line administration interface is installed. This tool is used to administer and configure all Administration Server and Web Server instances in a server farm remotely from the command line. For detailed information about the command-line tool and the powerful new command-line administration interface, see the Web Server 7.0 CLI Man Pages document. For basic information that will help you get started, also see Using the Administration Command-Line Interface in this document.
You can install the administration command-line interface without installing server core, but you cannot install server core without installing the administration command-line interface.