An operating system that is directed by entering text commands. DOS is an example of a widely used command line operating system. See DOS and command line. THIS DEFINITION IS FOR PERSONAL USE ONLY.

Windows, Microsoft, and third-party software makers supply numerous useful tools for the command line — but these are not always easy to use. Graphical user interfaces (GUI), on the other hand, ...

A text-based user interface to the computer. The command line is a blank line and cursor on the screen, allowing the user to type in instructions for immediate execution. All major operating systems ...