title: Cannot switch to jenkins user on aws ec2 linux?
body: <p>When I ssh into an aws ec2 Linux instance, I am <code>ec2-user</code>. The instance is a Jenkins master. When I try <code>su - jenkins</code> and entered the correct password, the system says <code>Last login: ....</code> which looks like the switching succeeded. But <code>whoami</code> says I'm still <code>ec2-user</code>.</p>
  
  <p>What am I missing? Thanks!</p>