Wow, I think of myself as very knowledgeable about Unix and its history, and I arguably got six of these right. It's a pretty tough quiz if you didn't work at Bell Labs and if you learned Unix after the 1980s.
Some of them have been immortalized past their time by the fortune (6) command, though. While I never used the source control system being referred to in question 1, I remember Ken Thompson's comparison of it to a "roach motel" trap from a fortune saying.
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[ 3.3 ms ] story [ 42.3 ms ] thread>22. Who was rabbit!bimmler
User Bimmler on the rabbit machine, maybe Elizabeth (IIRC, from K&R or K&P book).
>44. What language preceded C?
B.
>45. What language preceded B?
BCPL.
>64. How many different meanings does Unix assign to '.'?
1) Current directory
2) Prefix character for "hidden" file names.
>75. What does grep stand for?
Globally find Regular Expression and Print.
(1) first encounter was browsing Kirk McKusick’s CSRG archives of BSD source code, by which I learned the very basics
(2) close encounter was to uplift a project with nearly 25 years of history from SCCS to git: https://www.dns.cam.ac.uk/news/2014-11-27-sccs-to-git.html
Because everything in UNIX is a file ;-)
I'll let myself out now...