title: docker run with cd command fails with executable file not found in $PATH
body: <p>I want to execute this command:</p>
  
  <pre><code>docker run --volumes-from dbdata2 -v $(pwd):/backup ubuntu cd /dbdata &amp;&amp; tar xvf /backup/backup.tar
  </code></pre>
  
  <p>like described here <a href="http://docs.docker.com/userguide/dockervolumes/#backup-restore-or-migrate-data-volumes" rel="nofollow">http://docs.docker.com/userguide/dockervolumes/#backup-restore-or-migrate-data-volumes</a></p>
  
  <p>However I get the following error:</p>
  
  <pre><code>exec: "cd": executable file not found in $PATH
  Error response from daemon: Cannot start container a5da18532a63195f421757ab294c8fab82cd8e8beccb1ef29998d4b8b1293b43: [8] System error: exec: "cd": executable file not found in $PATH
  </code></pre>
  
  <p>Any ideas whats wrong?</p>