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Plan 9

Plan 9


Plan 9 boxshot. Published By:

Vita Nuova Holdings Limited


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Plan 9 is an advanced multi-user Open Source operating system designed with networking in mind. It runs on multiple hardware platforms and is highly suited to building large distributed systems.

Plan 9 was developed at Bell Labs (the research division of Lucent Technologies). In July 2000 the 3rd Edition was released as Open Source, and this is available from Vita Nuova in the form of a bootable CD. The developers of plan 9 include some of the original Unix designers including Rob Pike and Dennis Richie.

To the end user, Plan 9 bears a superficial resemblance to Unix, but the underlying operating system is very different. In particular, Plan 9 was designed as a network operating system, as opposed to Unix where networking support was added as an afterthought. Some of the standard Unix tools are available, but they have generally been either enhanced or completely rewritten.

Plan 9 has been ported to a number of architectures, including Intel x86, Sparc, Alpha, Power PC, and Arm.

Plan 9 is designed around the basic principle that all resources appear as files in a hierarchical file system (namespace) which is unique to each process. These resources are accessed via a network-level protocol called 9P which hides the exact location of services from the user. All servers provide their services as an exported hierarchy of files.

Features
  • The dump file system makes a daily "snapshot" of the filestore available to users
  • Unicode character set support throughout the system
  • Advanced kernel synchronization facilities for parallel processing
  • ANSI/POSIX environment emulator (APE)
  • Plumbing, a language driven way for applications to communicate
  • Acme - an editor, shell and window system for programmers
  • Sam - a screen editor with structural regular expressions
  • Support for MIME mail messages and IMAP4
  • Security - there is no super-user or root, and passwords are never sent over the network

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