title: How to create large PDF files (10MB, 50MB, 100MB, 200MB, 500MB, 1GB, etc.) for testing purposes?
body: <p>I tried this:</p>
  <pre class="lang-sh prettyprint-override"><code>for ((i=1; i&lt;=10; i++)); do convert 100MB.pdf 10MB.pdf 100MB.pdf; done
  </code></pre>
  <p>to create 100MB file but very quickly run out of RAM.</p>