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Text mode / command line (instructions are given line by line) user interface:
- Command interpreter
- To launch an application, type its name, and press Enter.
- Many commands (small programs) to browse and edit files, control program execution, display system information, etc.
The shell is much more flexible and powerful than a graphical user interface.
- GNU BASH, the default GNU/Linux shell - http://www.gnu.org/software/bash/bash.html