In the world of Unix and Gnu/Linux, the Command line is the way to go. Not only is it just cool (because that’s why we do everything, right?) but it’ll save you lots of time because you don’t have to move your hand away from your keyboard.
Productivity is everything!
And if you’re just starting out there are tons of resources out there on the web to fill you in, and if you’re going to start anywhere might as well start with “grep”: