title: Change the 'jenkins' default USER (user_name) on mac
body: <p>I just installed Jenkins on our mac server.
  However, looking at the configuration page, it set user.name=jenkins and USER=jenkins
  How do I change the 'jenkins' default USER (user_name) on the mac server to something else?</p>
  
  <p>Any help is really appreciated
  Thanks</p>