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== History ==
===Unix===
The [[Unix]] operating system was conceived and implemented in 1969 at [[AT&T]]'s Bell Laboratories in the [[United States]] by [[Ken Thompson]], [[Dennis Ritchie]], [[Douglas McIlroy]], and [[Joe Ossanna]] and first released in 1971. Unix was written in [[assembly language]] and later re-written in C in 1973 by [[Dennis Ritchie]]. Its wide availability and [[Porting|portability]] due to being written in [[C (programming language)|C]] meant that it was widely adopted, copied and modified by academic institutions and businesses, with its design being influential on authors of other systems.{{Citation needed|date=August 2009}}
===GNU===
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