In a previous life, I was a systems engineer at a company[0] that had several client with what would be charitably termed &quot;legacy&quot; systems, including SCO UnixWare and &quot;Olivetti Unix&quot;.<p>0: <a href="https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=10048801" rel="nofollow">https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=10048801</a>