"Linux has long been a contender in the corporate world to Windows. In addition, consumer interest is on the rise for this free, open sourcealternative to Windows or the Macintosh OS.
"In the days before the graphical user interface (GUI), which was first made popular by Apple and then cloned by Microsoft., the computing world was ruled by the command-line structure. Whether the operating system was Unix or DOS, graphics and audio capabilities were limited. Computer users typed commands at a prompt to run programs. Pointing devices did not exist and menus were rudimentary, text-based options lists..."
