title: csh script error: Variable name must begin with a letter
body: <pre><code>set number = $&lt;
  set n = @ $number % 2
  </code></pre>
  
  <p>I am new to csh. I am simply trying to understand basic stuff.
  I am getting this error: <code>set: Variable name must begin with a letter.</code>
  How do I fix it?</p>