How can I determine the interpreter that runs my bash shell?

Question

I was working on this tutorial here and I want to know the path so I can put it in my shell scripts on the top line as is good practice.

I was told this is not accurate:

echo "$SHELL"

What is the correct way to determine the path to the interpreter for shell scripts?

This is a shared hosting account and it is not obvious where it is located.

This is a follow up to a similar but not duplicate here.

Answer 1

You can use

which -a bash

to list all paths for the current user that point to a bash program.