Tail Recursion in bash

tail.sh

#!/bin/bash
# warning you need to build in something to stop the loop
# in practice, I used a kill file check before invoking the script again

echo 'tail recursive bash ftw'
sleep 10
$0 & 

# if you didn't listen and ran this as-is, try:
# killall tail.sh
# or (assuming nothing else is running sleep):
# kill $(ps -f | grep sleep | grep -v grep | awk '{print $3}')

Follow-up: The Racket developer Jay McCarthy has a good explanation of how exec works in "exec and Tail-call Optimization".