&gt; There used to be one Linux, one BSD, and a couple of Windows &#x2F; DOS. Mac was probably around too<p>And AIX of several releases. And HP&#x2F;UX. And SGI Irix. And Solaris + SunOS,
again, of several releases (mostly backward compatible, though).<p>Don&#x27;t say it was easier then than it is today, barring the young guns
constantly breaking their new Node.js packages and Ruby gems.