title: eval expression with environment variables
body: <p>Version 0.6</p>
  
  <p>I want to use julias -e(val) option with environment variables. How can I do that?</p>
  
  <p>Example:</p>
  
  <pre><code>y=10
  echo $y
  julia -e 'println($y)'
  </code></pre>
  
  <p>the echo works, as expected. But the julia line does not work. <code>ERROR: unsupported or misplaced expression $</code>. Now how do I make this work?</p>
  
  <p>I tried it with ENV["y"] but it does not find the variable.</p>