Implementing infinite wait in shell scripting

Question

This may sound trivial, but I\'m pretty sure this question hasn\'t been asked, or at least I can\'t find it.

I\'m looking for a way to construct an infinite wait

Answer 1

#!/bin/sh
at_term() {
  echo 'Terminated.'
  exit 0
}
trap at_term TERM
echo $$
while true; do
  sleep 20 &
  wait $!
done