Linux vs Windows: What do programmers use.

I was woundering if it is a common theme for most "Pro" programmers to use linux. I mean a book called C;Programming I have was written on linux. So which OS is it that programmers or hackers, per say, use?

``Pro'' programmer use Mac.

I switch between all 3 OSes. I use OSX for iPhone development (locked in), Windows for Android because my physical devices are kind of a bitch with Linux, and Linux for misc. use like web personal use.

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This is surprisingly true. Both weenie web developers and greybeard hackers seem to use OS X. I suppose it's because it's an easy, modern UNIX.