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| Unices by Bell |
| Research Unix |
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| V6 (1975) |
| V7 (1979) |
| V8 (1985) |
| V9 (1986) |
| V10 (1989) |
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| CB Unix |
| PWB/UNIX |
Tenth Edition Unix, also known as Version 10 Unix or V10, was the last version of the Research Unix operating system developed and used internally at Bell Labs. "Released" in 1989, it was the successor of V9. There was no V11; Unix development at Bell Labs was discontinued in favor of Plan 9.
Novelties in V10 included graphics typesetting tools designed to work with troff, a C interpreter, animation programs, and several tools later found in Plan 9: the Mk build tool and the rc shell.
V10 was the basis for Douglas McIlroy and Jonathan Reeds' IX multilevel-secure operating system.
