Unix - Shell Useful Resources
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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.
The Unix Forums - A forum for Unix lovers. Share your ideas and thoughts with other Unix experts.