Ask HN: New job is having me switch from Linux to Mac – how do I cope?

I've been using Linux over 15 years, and since 2005 I've been at startups where I controlled my destiny and ran whatever the heck I wanted on my work computer (typically Linux Mint Debian Edition on a Lenovo.)

Well, I took a new job and it starts on Monday (5/4). And part of that job is using the machine I'm given. As is. Which means a MBP running OS X.

Any real world tips that you can give me to ease the change?