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The Solaris Operating System, usually known simply as Solaris, is a free Unix-based operating system introduced by Sun Microsystems .

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AIX is IBM's industry-leading UNIX operating system that meets the demands of applications that businesses rely upon in today's marketplace.

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HP-UX (Hewlett Packard UniX) is Hewlett-Packard's proprietary implementation of the Unix operating system, based on System V.

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OS X is a line of Unix-based graphical operating systems developed, marketed, and sold by Apple.

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Santa Cruz Operation (SCO) was a software company based in Santa Cruz, California which was best known for selling three UNIX variants for Intel x86.

BSD, sometimes called Berkeley Unix, is a Unix operating system developed by the Computer Systems Research Group of the UC Berkeley.

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Information on The Single UNIX Specification, Version 3.

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