title: The command "ruby" does nothing on my Mac
body: <p>I can't get the Ruby interpreter to run on either of my Macs (one MacBook and one MacBook Pro, both running Snow Leopard). When I run it, by typing <code>ruby</code> in Terminal, nothing happens. It just sits there. I can kill it by pressing <code>Ctrl+C</code>, but that's it. I know the Ruby process is running, since I can see it in Activity Monitor, and running <code>ruby --version</code> works fine.</p>
  
  <p>I have tried the following, all to no avail:</p>
  
  <ol>
  <li>I have some bash customizations, so I tried disabling them, but that didn't help.</li>
  <li>I installed a new copy of Ruby 1.8.7 using MacPorts, but that one had the same problem.</li>
  <li>I tried quitting and restarting the Terminal application.</li>
  </ol>
  
  <p>Some other information that might be useful:</p>
  
  <ul>
  <li>I'm trying to run the version of Ruby that comes with Snow Leopard.</li>
  <li>I have installed Apple's developer tools.</li>
  <li>Other interpreters (Python, Io, etc.) work fine.</li>
  </ul>
  
  <p>I spent a while tonight searching for this problem online, but haven't found any discussion of it. I'm at a loss for what could be causing it, so any help anybody can provide would be greatly appreciated.</p>