title: What is your single most favorite command-line trick using Bash?
body: <p>We all know how to use <code>&lt;ctrl&gt;-R</code> to reverse search through history, but did you know you can use <code>&lt;ctrl&gt;-S</code> to forward search if you set <code>stty stop ""</code>?  Also, have you ever tried running bind -p to see all of your keyboard shortcuts listed?  There are over 455 on Mac OS X by default.  </p>
  
  <p>What is your single most favorite obscure trick, keyboard shortcut or shopt configuration using bash?</p>