Plan 9 was developed by the computer sciences research center at bell labs between the mid 1980s and 2002.
Its from bell labs is a distributed system.
One of the key features adopted from Unix was the use of the file system to access resources.
Plan 9 is most notable for representing all system interfaces, including those required for networking and the user-interface, through the filesystem rather than specialized interfaces.
Plan 9 aims to provide users with a workstation-independent working environment through the use of the 9P protocols. Plan 9 continues to be used and developed in some circles as a research operating system and by hobbyists.
Plan 9 from Bell Labs was developed by members of the Computing Science Research Center at Bell Labs, the same group that developed UNIX and C
Plan 9′s designers were interested in goals similar to those of microkernels, but made different architecture and design choices to achieve them. Plan 9′s design goals included:
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