I did, I remember working night shift in operations feeding tapes and in the down time I installed openbsd on an old pc. I would read the man pages following th

I did, I remember working night shift in operations feeding tapes and in the down time I installed openbsd on an old pc. I would read the man pages following the "see also:" sections. I remember using a script to show me random man pages so I could learn about things that would not catch my eye. I have this really cool wiki sort of software I made during that time it was written in shell, awk, sed, m4 and rcs. It was mainly written as an exercise to learn the unix environment. Probably full of every sort of injection vulnerability know to man. but it worked well enough in a benign environment. The shell bits are funny because a lot of it was built before I figured out shell functions. so every function was a separate shell script. The thing is the text of the article contradicts it's headline. yes there is a lot of auxiliary knowledge that seeps in from many sources, this is why a person good at operating one os will be good at operating another os, they will not be happy about it but should know the fundamentals and can pick up the incidentals quickly. however these incidentals are important, and you learn the unix incidentals by reading the unix manual.