AT&T was dropped from Multics. This led to the invention and implementation of the Unix OS in 1969. Unix was created by American Computer Science legends Kenneth Lane Thompson and Dennis MacAlistair Ritchie of AT&T Bell Labs. And the first version was released in 1970.
2 years later they created C out of UNIX. And there comes the future base of many programming languages! C added portability and availability to UNIX and thus it became increasingly popular, widely adopted, modified, and copied by businesses and academic institutions across the globe. AT&T was the sole owner of the UNIX copyrights.
American Programmer Richard Matthew Stallman began the GNU project to create a free UNIX-like operating system in 1983. He wrote GPL (GNU General Public License) as a part of his project. By the 1990s, there was enough software to build a complete operating system. However, Hurd, the GNU kernel couldn’t pull enough development work leaving GNU incomplete.
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