# Learn command line > A command-line interface or command language interpreter (CLI), also known as command-line user interface, console user interface, and character user interface (CUI), is a means of interacting with a computer program where the user (or client) issues commands to the program in the form of successive lines of text (command lines). - wikipedia ##### General Learning: - [codecademy: Learn the Command Line](https://www.codecademy.com/courses/learn-the-command-line) [watch] - [The Command Line Crash Course](http://cli.learncodethehardway.org/book/) [read] - [Meet the Command Line](http://www.pluralsight.com/courses/meet-command-line) [watch][$] ##### Mastering: - [Advanced Command Line Techniques](https://code.tutsplus.com/courses/advanced-command-line-techniques) [watch][$]