Facts about Plan 9

1. 08

   Acme, Plan 9's text editor written in the C language, integrated with the operating system's file server to execute shell commands selected directly within edited text windows.

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2. 07

   Bell Labs released Plan 9 source code under an open-source license in 2000, enabling academic institutions and hobbyists to study and modify the operating system's complete codebase.

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3. 06

   Nine researchers at Bell Labs, including Dave Presotto and Phil Winterbottom, contributed to Plan 9's development of the CPU server architecture enabling diskless workstations.

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4. 05

   Inferno, Bell Labs' commercial spinoff of Plan 9 released in 1996, ran on operating systems like Windows and Unix rather than requiring a dedicated Plan 9 kernel.

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5. 04

   Only four editions of Plan 9 were officially released between 1992 and 2015, with the final version 4 arriving a decade after Bell Labs stopped active development.

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6. 03

   Rob Pike and Ken Thompson designed Plan 9's windowing system called rio, which featured a novel three-button mouse interface for window management in 1994.

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7. 02

   The 9P protocol, Plan 9's distributed file system, enabled any networked machine to mount another's resources as local filesystems across Bell Labs' network in the 1990s.

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8. 01

   Developed at Bell Labs between 1987 and 2002, Plan 9 represented a radical reimagining of Unix's philosophy by treating all system resources as files.

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