title: Examples for fork without execv
body: <p>I'm taking Operating Systems course now, and was just introduced to the "fork", "execv" pair.</p>
  
  <p>As to my understanding right now, fork is used to create an abstraction for process while execv is used to make that process do some actual work. </p>
  
  <p>My intuition tells me that that is not that simple and there are some practical uses to only use "fork" without "execv".
  Can you make an example for me? </p>