How to get shell to self-detect using zsh or bash

Question

I\'ve a question on how to tell which shell the user is using. Suppose a script that if the user is using zsh, then put PATH to his .zshrc and if using bash sho

Answer 1

An alternative, might not work for all shells.

for x in $(ps -p $$)
do
  ans=$x
done
echo $ans