[TUHS] The Fourth Research Edition Unix Programmer's Manual

I don't think we had the Fourth Research Edition Unix Programmer's Manual available in typeset form. I played a bit with the troff manual pages on TUHS and managed to typeset it into PDF. You can find the PDF document at https://dspinellis.github.io/unix-v4man/v4man.pdf. I modernized the old shell scripts and corrected some minor markup glitches through commits that are recorded on a GitHub repository: https://github.com/dspinellis/unix-v4man. The process was surprisingly smooth. The scripts for generating the table of contents and the permuted index are based on the original ones. The few problems I encountered in the troff source had to do with missing spaces after requests, the ^F hyphenation character causing groff to complain, a failure of groff to honor .li requests followed by a line starting with a ., and two uses of a lowercase letter for specifying a font. I wrote from scratch a script to typeset everything into one volume. I could not find a shell script for typesetting the whole manual in any of the Research Editions. I assume the process of running the typesetter was so cumbersome, error prone, and time-consuming that it was manually performed on a page-by-page basis. Correct me if I'm wrong here. Diomidis Spinellis