title: What is the meaning of "docker ps -a"?
body: <p>Anyone who works with Docker regularly is familiar with the common commands <code>docker ps</code> and <code>docker ps -a</code>.</p>
  <p>I know that <code>docker ps</code> lists all running containers in the Docker engine, but what does the &quot;ps&quot; actually mean?</p>
  <p>I also know that <code>docker ps -a</code> has the effect of also listing containers that have stopped, but what does the <code>-a</code> actually mean?</p>