character user interface (CUI)
A Character User Interface(CUI) is a text-oriented user interface, such as the Command Line Interface( CLI), where the user enters his commands as text into a text-oriented command line.
Such a CUI interface or CLI interface is used, for example, in the DOS operating system. The CUI inputs are provided by command interpreters. In a Character User Interface (CUI), an array of characters, usually ASCII characters, is displayed on the screen.