Unix - Wikipedia
https://en.wikipedia.org/wiki/Unix
Unix (/ˈjuːnɪks/; trademarked as UNIX) is a family of multitasking, multiuser computer operating systems that derive from the original AT&T Unix...
The UNIX and Linux Forums - Free Tech Support
https://www.unix.com/
All Unix, Linux and other Unix-like operating systems are families of computer operating systems derived from the original Unix System from AT&T Bell Laboratories.
What is Unix: A Brief Introduction to Unix
https://www.softwaretestinghelp.com/unix-introduction/
What is Unix? Unix and Unix-like operating systems are a family of computer operating systems that are derived from the original Unix System from Bell Labs. Initial proprietary derivatives included the...
The UNIX System -- History and Timeline -- UNIX History
http://www.unix.org/what_is_unix/history_timeline.html
... Unix was born in 1969 not 1974, and the account of its development makes a little-known and perhaps instructive story. Today, without UNIX systems, the Internet would come to a screeching halt.
UNIX Tutorial - Introduction
http://www.ee.surrey.ac.uk/Teaching/Unix/unixintro.html
UNIX is an operating system which was first developed in the 1960s, and has been under constant However, knowledge of UNIX is required for operations which aren't covered by a graphical program...
Top 10 Unix Based Operating Systems
http://www.linuxandubuntu.com/home/top-10-unix-based-operating-systems
The UNIX operating system was created more than four decades ago at AT&T's Bell Laboratories. With continuous development since its inception, UNIX has made its presence from tiny embedded devices...