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http://www.acm.org/crossroads/xrds1-3/unix-standards.html. Retrieved on 2007-05-11 11:18.

Perhaps the world’s most popular operating system today is also the hardest one to define. Unix is undoubtedly one of the most widely used operating systems. Several versions of Unix compete in the commercial marketplace with products such as DOS, MS windows 3.1, Windows NT, and VMS. Even with its widespread use and 25 year history, in some cases telling what isn’t Unix is difficult. The push to standardize Unix has been growing for quite some time now with several groups mixing it up. Whether the issue is about to come to a head is unclear. The only outcome has been verification of an old gunnery sergeant’s saying “Ain’t nothing easy when you’re doing it for real! …