title: Extract .tar from .tar.gz in linux
body: <p>I understand that <code>*.tar.gz</code> is a file, which is both archived(<code>.tar</code>) &amp; compressed(<code>.gz</code>).
  I want to un-compress while retaining the archive. That is from <code>*.tar.gz</code>, I need to get <code>*.tar</code>. </p>
  
  <p>When I execute <code>tar zxf filename.tar.gz</code>, the command un-compresses as well as extracts all the files within this archive. When I ignore the option <code>x</code>, the usage <code>tar zf filename.tar.gz</code> seems to be invalid.</p>
  
  <blockquote>
    <p>tar: You must specify one of the <code>-Acdtrux' or</code>--test-label'  options</p>
  </blockquote>
  
  <p>Thanks in advance!</p>