title: Docker exec Requires minimum of 2 arguments
body: <p>I am using a shell script on Linux in order to execute some Docker commands : </p>
  
  <pre><code>docker exec -t -i test1 passwd
  ...
  docker exec -t -i test2 passwd
  </code></pre>
  
  <p>And on the second exec command I receive the following error : </p>
  
  <pre><code>docker: "exec" requires a minimum of 2 arguments.
  </code></pre>
  
  <p>What am I doing wrong, or what am I missing?</p>
  
  <p>Thank you in advance.</p>