&gt;&gt; &quot;Mainframe&quot; doesn&#x27;t necessarily mean &quot;old&quot;.<p>Yep, today they tend to look like something out of Battlestar Galactica:<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;IBM_System_z" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;IBM_System_z</a><p>I&#x27;ve started working with Z&#x2F;OS on Zseries machines just a few months ago. Obviously, I&#x27;m still learning. There is a _lot_ to learn- it&#x27;s nothing like linux :0