There is also the book "Exercises in Programming Style" that uses the term frequency problem to illustrate 33 different programming paradigms (including a shell

There is also the book "Exercises in Programming Style" that uses the term frequency problem to illustrate 33 different programming paradigms (including a shell solution). https://www.amazon.com/Exercises-Programming-Style-Cristina-Videira/dp/1482227371/ https://www.amazon.com/Exercises-Programming-Style-Cristina-...