A user interface is the method by which the user and the computer exchange information and instructions. There are three main types - command-line, menu driven and graphical user interface (GUI).

graphical user interface (GUI) - sometimes known as WIMP (Windows, Icons, Menus, Pointers) interface mobile user interface (Mobile UI) command line interface (CLI) ...

Colin Walters of Red Hat chaired a FOSSCamp session about Hotwire, a unique and innovative graphical shell environment designed to improve the command-line user experience.

Preceded by "Please note" in bold, the HP page states "the Linux command line interface is disabled on this edition." I contacted HP to ask why it had disabled the Linux command line interface.