[quotemsg=10545461,0,1118433][citation][nom]athulajp[/nom]Dude GNU's not UNIX[/citation]
Soory DUDE but OS X was based off of Berkley's distro of UNIX, OS X is based upon the Mach kernel. Certain parts from FreeBSD's and NetBSD's implementation of Unix were incorporated in NeXTSTEP, the core of Mac OS X. NeXTSTEP was the graphical, object-oriented, and UNIX-based operating system developed by Steve Jobs' company NeXT after he left Apple in 1985
Linux is: Linux (i/ˈlɪnəks/ lin-əks or /ˈlɪnʊks/ lin-uuks) is a Unix-like computer operating system assembled under the model of free and open source software development and distribution. The defining component of Linux is the Linux kernel, an operating system kernel first released 5 October 1991 by Linus Torvalds.
You don't get the joke: GNU stands for Gnu's Not Unix. It's a unix like core, but it's not unix. I know very well that writing code for a UNIX based OS is pretty much the same as writing it for a linux distro but it was just a joke.