title: 'sudo gem install' or 'gem install' and gem locations
body: <p>Running '<code>sudo gem list --local</code>' and '<code>gem list --local</code>' give me differing results. My gem path is set to my home folder and only contains the gems from '<code>gem list --local</code>'.</p>
  
  <p>It's probably not good to have gems installed in different directories on my computer, so should I have the gem path set differently, and should I always use <code>sudo</code> when installing something?</p>
  
  <pre><code>my ~/.profile
  export PATH=/opt/local/bin:/opt/local/sbin:$PATH
  export PATH="/usr/local/bin:/usr/local/sbin:/usr/local/mysql/bin:$PATH"
  </code></pre>
  
  <p>~/.bash_profile is empty.</p>