title: Delete all but the most recent X files in bash
body: <p>Is there a simple way, in a pretty standard UNIX environment with bash, to run a command to delete all but the most recent X files from a directory?</p>
  
  <p>To give a bit more of a concrete example, imagine some cron job writing out a file (say, a log file or a tar-ed up backup) to a directory every hour. I'd like a way to have another cron job running which would remove the oldest files in that directory until there are less than, say, 5.</p>
  
  <p>And just to be clear, there's only one file present, it should never be deleted.</p>