title: How to add a directory to the $PATH variable with macosx leopard
body: <p>I really am unable to add a directory to the <code>$PATH</code> variable. I have tried to add a text file to <code>etc/paths.d/</code> containing the path I want to add, but the OS refuses to let me add a file to that directory (permission denied). I don't know why, since I log in as admin...</p>
  <p>Please help me, I need to add the <code>adb</code> path for the Android SDK on macosx.</p>