> the terminal provides a very fast feedback loop where I can iteratively examine the output of a command and refine the filters I apply. As a result, I am able

> the terminal provides a very fast feedback loop where I can iteratively examine the output of a command and refine the filters I apply. As a result, I am able to prototype commands quickly and accurately. That's what any REPL does. And it works great with typed data. Sometimes even with graphical output.