title: Errors when trying to install jenkins using Homebrew
body: <p><a href="https://i.stack.imgur.com/c3kZa.png" rel="nofollow noreferrer">screenshot of actual error message</a></p>
  <p>I have tried all the alternative ways to install jenkins on my macbook air but with no lack. I will appreciate anyone with the current solution to this.</p>
  <p>This is the error message I get after running <code>brew install jenkins</code>:</p>
  <pre><code>Error: No similarly named formulae found.
  Error: No available formula or cask with the name &quot;jenkins&quot;.
  It was migrated from homebrew/cask to homebrew/core.
  </code></pre>
  <p>I also get a &quot;fata&quot; message</p>
  <pre><code>fatal: Needed a single revision
  </code></pre>
  <p>I am very knew to Jenkins and trying to learn usage.</p>