Answer:
Command Interpreter
Explanation:
A command interpreter allows the interaction between users and programs. Just like modern day Graphical user interface where users interact with the programs. Although, they are not as attractive as GUI but they are handy when memory constraints arise.
A command interpreter understands and process various commands exchanged by users in the form of text. Users enter their queries and get results from the command interpreter. Whereas in the case of GUI, users have all the information and icons to select the desired option and get the results.
