$$ in a script vs $$ in a subshell

Question

$$ gives process id of the script process when used in a script, like this:

Example 1

#!/bin/bash
# processid.sh
# print process ids

ps         


        

Answer 1

I tried and escaping (to pass the $$ to the subshell) does not work as the subshell inherits the $$ value from the parent bash. The solution to this is to use $BASHPID.

(echo $$; echo $BASHPID)

prints the PID from the parent shell and from the subshell.