If Macs came nothing but this, I'd still buy it. Terminal (In Your Utilities Folder) That's right, boys and girls, OS X is a UNIX-based operating system. "What?!?," you say. "Why haven't I heard this before?" I know, I know, it's a shock. Well, this one might be a duh, but it's important to point out. If, after making the switch, you find yourself missing the command-prompt, don't forget that it's always accessible through the Terminal.