<Table> Unix <Tr> <Td colspan="2"> Evolution of Unix and Unix - like systems </Td> </Tr> <Tr> <Th> Developer </Th> <Td> Ken Thompson , Dennis Ritchie , Brian Kernighan , Douglas McIlroy , and Joe Ossanna at Bell Labs </Td> </Tr> <Tr> <Th> Written in </Th> <Td> C and assembly language </Td> </Tr> <Tr> <Th> OS family </Th> <Td> Unix </Td> </Tr> <Tr> <Th> Working state </Th> <Td> Current </Td> </Tr> <Tr> <Th> Source model </Th> <Td> Historically closed - source , while some Unix projects ( including BSD family and illumos ) are open - source </Td> </Tr> <Tr> <Th> Initial release </Th> <Td> Development started in 1969 ; 49 years ago ( 1969 ) First manual published internally in November 1971 ( 1971 - 11 ) Announced outside Bell Labs in October 1973 ( 1973 - 10 ) </Td> </Tr> <Tr> <Th> Available in </Th> <Td> English </Td> </Tr> <Tr> <Th> Kernel type </Th> <Td> Varies ; monolithic , microkernel , hybrid </Td> </Tr> <Tr> <Th> Default user interface </Th> <Td> Command - line interface and Graphical ( X Window System ) </Td> </Tr> <Tr> <Th> License </Th> <Td> Varies ; some versions are proprietary , others are free / open - source software </Td> </Tr> <Tr> <Th> Official website </Th> <Td> opengroup.org/unix </Td> </Tr> </Table>
<Table> Unix <Tr> <Td colspan="2"> Evolution of Unix and Unix - like systems </Td> </Tr> <Tr> <Th> Developer </Th> <Td> Ken Thompson , Dennis Ritchie , Brian Kernighan , Douglas McIlroy , and Joe Ossanna at Bell Labs </Td> </Tr> <Tr> <Th> Written in </Th> <Td> C and assembly language </Td> </Tr> <Tr> <Th> OS family </Th> <Td> Unix </Td> </Tr> <Tr> <Th> Working state </Th> <Td> Current </Td> </Tr> <Tr> <Th> Source model </Th> <Td> Historically closed - source , while some Unix projects ( including BSD family and illumos ) are open - source </Td> </Tr> <Tr> <Th> Initial release </Th> <Td> Development started in 1969 ; 49 years ago ( 1969 ) First manual published internally in November 1971 ( 1971 - 11 ) Announced outside Bell Labs in October 1973 ( 1973 - 10 ) </Td> </Tr> <Tr> <Th> Available in </Th> <Td> English </Td> </Tr> <Tr> <Th> Kernel type </Th> <Td> Varies ; monolithic , microkernel , hybrid </Td> </Tr> <Tr> <Th> Default user interface </Th> <Td> Command - line interface and Graphical ( X Window System ) </Td> </Tr> <Tr> <Th> License </Th> <Td> Varies ; some versions are proprietary , others are free / open - source software </Td> </Tr> <Tr> <Th> Official website </Th> <Td> opengroup.org/unix </Td> </Tr> </Table>
who are primarily credited with the development of the unix operating system
who are primarily credited with the development of the unix operating system
Ken Thompson Dennis Ritchie Brian Kernighan Douglas McIlroy Joe Ossanna
Ken Thompson Dennis Ritchie Brian Kernighan Douglas McIlroy Joe Ossanna