Maybe that is the part I am misunderstanding. I'm an experienced engineer and I code for fun, and think that coding a Forth interpreter (or any interpreter) wou

Maybe that is the part I am misunderstanding. I'm an experienced engineer and I code for fun, and think that coding a Forth interpreter (or any interpreter) would be fun, but have a very hard time believing that "fun" (versus "trying to impress people") is the primary motivator to using Bash to code an interpreter. But I acknowledge that I could be wrong too. Maybe they had a blast using Bash.