Create What is GNU, POSIX, Linux and Unix?

Author: nkatre

What is GNU, POSIX, Linux and Unix?

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+What is GNU ?
+Ans. GNU stands for "Generic Not Unix".
+For more info read, https://kb.iu.edu/d/acuo
+
+What is POSIX ?
+Ans. Please read everything about POSIX on http://stackoverflow.com/questions/1780599/i-never-really-understood-what-is-posix
+
+What is Linux ?
+Ans. http://en.wikipedia.org/wiki/Linux
+
+What is UNIX ?
+Ans. http://en.wikipedia.org/wiki/Unix