1. What is a user interface? 2. How does a command line interface work? 3. When the user runs a program in a text-based environment, such as the command line, what determines the order in which things...

1. What is a user interface?

2. How does a command line interface work?

3. When the user runs a program in a text-based environment, such as the command line, what determines the order in which things happen?