title: How to get a unix script to run every 15 seconds?
body: <p>I've seen a few solutions, including watch and simply running a looping (and sleeping) script in the background, but nothing has been ideal.</p>
  
  <p>I have a script that needs to run every 15 seconds, and since cron won't support seconds, I'm left to figuring out something else.</p>
  
  <p>What's the most robust and efficient way to run a script every 15 seconds on unix? The script needs to also run after a reboot.</p>