"In particular you need to avoid writing code for situations that will never arise in practice. You need to avoid writing code to handle a general problem that you are never going to encounter. I don't need to solve the general problem when I only have to solve these specific cases." -- Chuck Moore
This is for anything regarding the command line, in any operating system. All questions (including dumb ones), tips, and interesting programs/console applications you've found or made yourself are welcome. Linux / BSD / OSX / Windows CLI apps or questions or comments, we're happy to take them all!