Yeah, honestly POSIX shell already has C arithmetic, so it would be natural for it to have set operations, a la Python (x | y, x & y, etc.) Here's Fizz Buzz in shell, without executing external processes like "expr":

    for x in $(seq 100); do
      { (( x % 5 == 0 )) && (( x % 3 == 0 )) && echo "$x fizzbuzz"; } ||
      { (( x % 5 == 0 )) && echo "$x buzz"; } ||
      { (( x % 3 == 0 )) && echo "$x fizz"; } ||
      echo "$x"
    done

I'm a big fan of the Unix philosophy, but after a few decades, it makes sense to fold commonly-used operations into the shell, especially when they cost almost nothing to implement with zero bugs. There's no benefit to "streaming" for these operations; on the contrary, it's probably an de-optimization.

I plan to add set expressions to my new shell: http://www.oilshell.org/blog/

credit: https://github.com/Aricg/FizzBuzz---Bash/blob/master/FizzBuz...