Version 9 Unix

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Ninth Edition Unix, also known as Version 9 Unix or V9, was a version of the Research Unix operating system developed and used internally at the Bell Labs Information Sciences Research Division, "released" in September 1986. V9 was the successor to V8, and the predecessor to the last Research Unix version, V10. It was based on 4.3BSD, and featured a generalized version of the STREAMS IPC mechanism introduced in V8. [link]

The book The AWK Programming Language was prepared on a VAX 8650 running Ninth Edition Unix.

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