The following resources contain additional information on Unix. Please use them to get more in-depth knowledge on this topic.
Bell Labs − The Creation of the UNIX Operating System. Gives overview and history of UNIX operating system.
BSD UNIX − FreeBSD is an advanced UNIX operating system for modern server, desktop, and embedded computer platforms.
Linux Online − Linux is a free Unix-type operating system originally created by Linus Torvalds with the assistance of developers around the world.
Unix @ Wikipedia − A brief description of Unix Operating system.
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