<Table> <Tr> <Td> </Td> <Td> This article's lead section may not adequately summarize key points of its contents . Please consider expanding the lead to provide an accessible overview of all important aspects of the article . Please discuss this issue on the article's talk page . (July 2011) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article's lead section may not adequately summarize key points of its contents . Please consider expanding the lead to provide an accessible overview of all important aspects of the article . Please discuss this issue on the article's talk page . (July 2011) </Td> </Tr> <P> The history of Linux began in 1991 with the commencement of a personal project by Finnish student Linus Torvalds to create a new free operating system kernel . Since then, the resulting Linux kernel has been marked by constant growth throughout its history . Since the initial release of its source code in 1991, it has grown from a small number of C files under a license prohibiting commercial distribution to the 4.2. 3 version in 2015 with more than 18 million lines of source code under the GNU General Public License v2 . </P> <P> After AT&T had dropped out of the Multics project, the Unix operating system was conceived and implemented by Ken Thompson and Dennis Ritchie (both of AT&T Bell Laboratories) in 1969 and first released in 1970 . Later they rewrote it in a new programming language, C, to make it portable . The availability and portability of Unix caused it to be widely adopted, copied and modified by academic institutions and businesses . </P>

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