title: Docker: Alias command name to run another sibling docker container
body: <p>I know how to -v the docker socket into a container to make the host's docker daemon available inside a container. Fine.</p>
  
  <p>I have a dockerized application A that can operate on files on the host.</p>
  
  <p>I have another dockerized application B that wants to use that application A to operate on files on the host, but is hardcoded to call <code>/usr/bin/A filename</code>. </p>
  
  <p>How do I alias <code>/usr/bin/A</code> within container B, so that it will call out to the other container, like</p>
  
  <p><code>docker run -ti --rm A filename</code></p>