[TUHS] unix v4 tape found

[segaloco via TUHS]

On Friday, December 19th, 2025 at 17:53, Angelo Papenhoff via TUHS <tuhs at tuhs.org> wrote:

> I extracted it: http://squoze.net/UNIX/v4/
>
> aap

Some observations:

- In this init(1), /etc/getty is called as the only member of a single
  member array "com".  In the current V5, /etc/getty is instead provided
  as the only execution target for dfork.  The V5 manual adds that a
  line in /etc/ttys indicates the specifiable program in this array.
  The V6 manual removes again this idea of /etc/getty being one of many
  possible targets in a table, making this a more V5-ish init(1) than
  the current V5 copy.  Additionally, the V4 manual indicates that
  init(1) still pulls TTYs from an internal table.  This init(1) is
  using /etc/ttys.  Finally, utmp is still in /tmp in this tape, whereas
  V6 sees it moved to /etc, as is the case in the current V5.

- The copy of wc(1) present matches the V5 manual page in that it
  includes a number of options.

- Stty(1) here also is more V5-ish in that it does not implement the hup
  options nor erase, kill, or ek.

Just a few, but some areas marking this as matching V5 well.  Probably
tail end of calling it "V4" at all.

- Matt G.

V4->V5 /usr/man diff - https://gitlab.com/segaloco/mandiff/-/compare/v4...v5?from_project_id=44843539
V5->V6 /usr/man diff - https://gitlab.com/segaloco/mandiff/-/compare/v5...v6?from_project_id=44843539