title: How to check if a service that I don't know the name of is running on Ubuntu
body: <p>I do not know the service's name, but would like to stop the service by checking its status. </p>
  
  <p>For example, if I want to check if the <a href="http://en.wikipedia.org/wiki/PostgreSQL" rel="noreferrer">PostgreSQL</a> service is running or not, but I don't know the service's name, then how could I check its status?</p>
  
  <p>I know the command to check the status if the service name is known.</p>