Mac Tip: Who is Darwin?

Not who, what. Darwin is the BSD environment that sits underneath the Mac OS. And, amazingly, all of that power and beauty is at your grasp with the Terminal application.

To get your party started, go to /Applications/Utilities and launch Terminal.

To get you started, type uptime at the command prompt; the command, I believe, is self-explanatory.

If not, try using the man command (e.g. man uptime)