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?

EXPERT PROGRAMMERS USE OSX.

when i had to choose between spending 10 hours downloading installing configuring linux/winblows/whatever or spending 2 hours earning money for OSX...