title: Passing definition parameter through pdfTeX(pdflatex) does not work
body: <p>Commandline for pdflatex:</p>
  <pre><code>pdflatex main.tex &quot;\def\anonymous{}\include{main}&quot;
  </code></pre>
  <p>main.tex:</p>
  <pre><code>\documentclass[a4paper]{article}
  \begin{document}
  \ifx\anonymous\undefined
  Lorem ipsum dolor sit amet
  \else
  Nam eu velit eget neque mollis imperdiet
  \fi
  \end{document}
  </code></pre>
  <p>The above command line will make PDF file which holds &quot;Lorem ipsum dolor sit amet&quot;.</p>
  <p>How can I make the output to hold &quot;Nam eu velit eget neque mollis imperdiet&quot;?</p>