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).
A command-line interface allows the user to interact with the computer by typing in commands [command: a directive given to a computer program ]. The computer displays a prompt, the user keys in the command and presses enter or return.
In the early days of personal computers, all PCs used command-line interfaces.
An example of a common command driven interface is MS-DOS. The MS-DOS command to display all files on c:\ would be: dir c:\
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