Apparently I'm an exception, I was working with unix professionally before I bought my first home PC. Linux wasn't available yet, but I went over as soon as I heard of it and never looked at a MS OS again except at work. The thing is, to answer the question what applications of that period do I still use? well, practically ALL OF THEM. A linux user of 2019 (at least one who always prefers CLI) is an animal of almost the same species as a unix user of 1990. A lot of the commands have evolved and became more sophisticated, but basically it's still the same ls, cd, du and some dozens more as 30 years ago. You don't need to learn to drive again with every new car model.

Good for you! we all know that the compiler is MUCH slower to parse loopIndex than a simple i :)

All rubbish. Where are the elephants and the turtle?

For miniscripts no, those will usually be sufficient. if not then python, perl, tcl... whatever.

I have been a linux user since the late 90s. Whenever my arm was twisted to work on on a windows setting (all to often X| ) the first thing I always did was install cygwin on it before anything else. bash saved me from early insanity. I never looked at PowerShell, maybe I have missed something. Next time I'm young I'll try it, promise.

My memory is also going. I had to look up FTFY.

You want to leave documentation? Just set the titles, copy-paste man pages for the contents. Nobody ever reads this junk anyway, we all know that the code (if there is a "the" code) is light years away from any existing docs. No, that's not what I did when I left, but I could have.