[noobdood]

My tries:

>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.