title: Can multiple .gz files be combined such that they extract into a single file?
body: <p>Lets say that I have 3 file: <code>1.txt</code>, <code>2.txt</code> and <code>3.txt</code> which have all be gzipped.  I'm aware that gzip allows multiple files to be combined using cat:</p>
  
  <pre><code>cat 1.gz 2.gz 3.gz &gt; 123.gz
  </code></pre>
  
  <p>However when 123.gz is extracted it will produce the original 3 files.  </p>
  
  <p>Is it possible to combine the three archives in a way that the individual files within the archive will be combined into a single file as well?</p>