title: How to uninstall Jenkins on mac completely
body: <p>I installed Jenkins with brew on mac. But it occurs some problem, I want to re-install it. Previously, at the first time I access <a href="http://localhost:8080" rel="noreferrer">http://localhost:8080</a>, the page guides you to install some plugins and need you to input the password. But when I use 'brew uninstall jenkins' command and install again, the page will not show. I don't remember the previous default admin passsword. So I can't access the jenkins now. I delete the homebrew cache as well, it not worked.
  Is there any solutions to uninstall Jenkins completely? I just want to start from the beginning of the installation.
  Thanks.</p>