The complete kernel comprised 18000 lines of code.
The final official release was in early 2015. Under Plan 9, UNIX's everything is a file metaphor is extended via a pervasive network-centric filesystem, and the cursor-addressed, terminal-based I/O at the heart of UNIX-like operating systems is replaced by a windowing system and graphical user interface without cursor addressing, although rc, the Plan 9 shell, is text-based. 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.
Plan 9 from Bell Labs is a distributed operating system, originating in the Computing Science Research Center (CSRC) at Bell Labs in the mid-1980s, and building on UNIX concepts first developed there in the late 1960s.
(The name of the project's mascot, “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 in the late 1980s, by members of the Computing Science Research Center at Bell Labs, the same group that originally developed Unix and the C programming language.
Ritchie commented that the developers did not expect to do "much displacement" given how established other operating systems had become. By 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.
After several years of development and internal use, Bell Labs shipped the operating system to universities in 1992.
The entire system was converted to general use in 1992.
Ritchie commented that the developers did not expect to do "much displacement" given how established other operating systems had become. By 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.
Ritchie commented that the developers did not expect to do "much displacement" given how established other operating systems had become. By 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 personnel, produced minor daily releases in the form of ISO images.
(According to a 2006 count, the kernel was then some 150,000 lines, but this was compared against more than 4.8 million in Linux.) Within the operating systems research community, as well as the commercial Unix world, other attempts at achieving distributed computing and remote filesystem access were made concurrently with the Plan 9 design effort.
The final official release was in early 2015. Under Plan 9, UNIX's everything is a file metaphor is extended via a pervasive network-centric filesystem, and the cursor-addressed, terminal-based I/O at the heart of UNIX-like operating systems is replaced by a windowing system and graphical user interface without cursor addressing, although rc, the Plan 9 shell, is text-based. 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.
On March 23 2021, development resumed following the transfer of copyright from Bell Labs to the Plan 9 Foundation.
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