How to Redirect the Output of Files to a File

There is a command in Linux that I didn't know about until the other day. It's designed to do exactly what you want, and they called it T as in like a plumber's T. And this will allow you to do the output to standard out like you normally would, but it'll also redirect to a file at the same time. So if you're like me and you want to see it and you also want it in a file, this is amazing. Um, so all right. Cool. And now I want to go build something.