Pass-by-global is awful. Make smaller functions that return (echo) a single string. Your bash is untestable, but that's just because of your chosen abstraction

Pass-by-global is awful. Make smaller functions that return (echo) a single string. Your bash is untestable, but that's just because of your chosen abstractions. Bash is just a proper script language with a weird string and implicit IO system. Disclaimer: I stick to POSIX sh but same difference.