"If you go to work on your goals, your goals will go to work on you. If you go to work on your plan, your plan will go to work on you. Whatever good things we build, end up building us."
Command line also referred to as terminal acts as an interface to your computer, it allows you to perform actions that would be otherwise long and repetitive very quickly, such as renaming 100+ files.
Programming languages such as Ruby/Python are run in a terminal, so it is important for us to learn how to perform certain tasks through the terminal, this will prevent us from having to jump back and forth between the graphical interface and the terminal command line.