title: How do I find .bash_profile and add to my shell's initialization file?
body: <p>I am trying to upgrade ruby using rvm.
  On the <a href="http://pragmaticstudio.com/blog/2010/9/23/install-rails-ruby-mac" rel="noreferrer">pragmatic site</a>, it says:</p>
  <blockquote>
  <p>The important part is to add the following line to the end of your shell's initialization file (.bash_profile):</p>
  <p><code>[[ -s &quot;$HOME/.rvm/scripts/rvm&quot; ]] &amp;&amp; source &quot;$HOME/.rvm/scripts/rvm&quot;</code></p>
  </blockquote>
  <p>How do I do this? Where is this initialization file?
  Please help</p>