Ansible error on shell command returning zero : <p>Ansible doesn't seem to be able to handle the result '0' for shell commands. This</p>

<pre><code>- name: Check if swap exists
  shell: "swapon -s | grep -ci dev"
  register: swap_exists
</code></pre>

<p>Returns an error </p>

<blockquote>
  <p>"msg": "non-zero return code"</p>
</blockquote>

<p>But when I replace "dev" with "type", which actually always occurs and gives a count of at least 1, then the command is successful and no error is thrown.</p>

<p>I also tried with <code>command:</code> instead of <code>shell:</code> - it doesn't give an error, but then the command is also not executed.</p>
