UNIX Edition Zero
At the end of 2015, Doug McIlroy sent this e-mail in to the TUHS mailing list:
Among the papers of the late Bob Morris I have found a Unix manual that I don't remember at all--a draft by Dennis Ritchie, in the style of (but not designated as) a technical report with numbered sections and subsections. It does not resemble the familiar layout of the numbered editions. Besides the usual overview of kernel and shell, it describes system calls and some commands, in a layout unrelated to the familiar man-page style. Detailed reference/tutorial manuals for as, roff, db and ed are included as appendices. The famous and well-justified claim that "UNIX contains a numer of features very seldom offered even by larger systems" appears on page 1. The document is evidently ancestral to both the recognized manuals and the SIGOPS/CACM paper. It apparently dates from mid-1971 when Unix had been running for a "few months" on the PDP-11. At that time there were only 21 system calls, a number that had increased to 34 by November when the v1 manual was produced.
UnixEditionZero.pdf - PDF scan
UnixEditionZero-OCR.pdf - OCR
UnixEditionZero-reset_troff.pdf - Re-set in
troff by David Lind