Any good UNIX references?

in Genius Bar edited January 2014
I am interested in digging deeper into OS X and UNIX. I also wanna get more into learning how to develop tools for OS X. I know these are kinda interchangable but not totally.

Are there any good resources online for stuff like this? I can code PHP so learning new programming tools won't be that least I hope not.

Any help would be greatly appreciated.



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