title: unix - how to use wait for multiple background processes
body: <p>I'm using a korn shell. Is this a possible scenario using wait? Where I have (2) instances of it?</p>
  
  <pre><code>#!/usr/bin/ksh
  a &amp;
  wait
  b &amp;
  c &amp;
  wait
  d
  </code></pre>
  
  <p>My goal is to run a first, once complete, then fire off b,c at the same time. Once b,c is complete, then run "d".</p>