title: sh: grep: command not found
body: <p>I'm executing a command <code>docker ps -a | grep &lt;imagename&gt;</code> from another container. </p>
  
  <p>It shows</p>
  
  <pre><code>sh: grep: command not found
  sh: docker: command not found
  </code></pre>
  
  <p>Can anyone support me on it?</p>