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(mirror) |influenced by = (Research) Unix, Cambridge Distributed Computing System }} Plan 9 from Bell Labs is a distributed operating system, originally developed by the Computing Sciences Research Center at Bell Labs between the mid-1980s and 2002. It takes some of the principles of Unix, developed in the same research group, but extends these to a networked environment with graphics terminals. In Plan 9, virtually all computing resources, including files, network connections, and peripheral devices, are represented through the file system rather than specialized interfaces. A unified network protocol called 9P ties a network of computers running Plan 9 together, allowing them to share all resources so represented. The name ''Plan 9 from Bell Labs'' is a reference to the Ed Wood 1959 cult science fiction Z-movie ''Plan 9 from Outer Space''.〔 Also, Glenda, the Plan 9 Bunny, is presumably a reference to Wood's film ''Glen or Glenda''. The system continues to be used and developed by operating system researchers and hobbyists.〔〔 == History == Plan 9 from Bell Labs was originally developed, starting mid-1980s, by members of the Computing Science Research Center at Bell Labs, the same group that originally developed Unix and C.〔 The Plan 9 team was initially led by Rob Pike, Ken Thompson, Dave Presotto and Phil Winterbottom, with support from Dennis Ritchie as head of the Computing Techniques Research Department. Over the years, many notable developers have contributed to the project including Brian Kernighan, Tom Duff, Doug McIlroy, Bjarne Stroustrup and Bruce Ellis.〔 Plan 9 replaced Unix as Bell Labs's primary platform for operating systems research. It explored several changes to the original Unix model that facilitate the use and programming of the system, notably in distributed multi-user environments. After several years of development and internal use, Bell Labs shipped the operating system to universities in 1992. Three years later, in 1995, Plan 9 was made available for commercial parties by AT&T via the book publisher Harcourt Brace. With source licenses costing $350, AT&T targeted the embedded systems market rather than the computer market at large; Ritchie commented that the developers did not expect to do "much displacement" given how established other operating systems had become. As of early 1996, the Plan 9 project had been "put on the back burner" by AT&T in favor of Inferno, intended to be a rival to Sun Microsystems' Java platform. In the late 1990s, Bell Labs' new owner Lucent Technologies dropped commercial support for the project and in 2000, a third release was distributed under an open source license. A fourth release under a new free software license occurred in 2002.〔 A user and development community, including current and former Bell Labs members and Massachusetts Institute of Technology personnel, continues to produce minor daily releases in form of ISO images. Bell Labs still hosts the development.〔 The development source tree is accessible over the 9P and HTTP protocols and is used to update existing installations.〔 In addition to the official components of the OS included in the ISOs, Bell Labs also hosts a repository of externally developed applications and tools. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Plan 9 from Bell Labs」の詳細全文を読む スポンサード リンク
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