title: Replacement for source in sh
body: <p>I need to set the environment variables,  usually we do this by</p>
  
  <pre><code>source script.sh
  </code></pre>
  
  <p>But now, I am automating it during the boot process and it looks like the root boots by default with <code>sh</code> shell.  How do I source this script in <code>sh</code>?</p>