title: what is unix/linux internals?
body: <p>When somebody asks me about how strong you are in <b>unix/linux internals</b> ? What do they really mean ? </p>
  
  <p>Though i have some idea, i would like to hear from some experts that, what is really meant by unix/linux internals.</p>
  
  <p>My ideas are, i have to be strong in,</p>
  
  <ul>
  <li>linux boot process</li>
  <li>user creation</li>
  <li>how does a command executes</li>
  <li>filesystem related details</li>
  <li>process details</li>
  </ul>
  
  <p>I would like to know, whether this is sufficient or something else there ?</p>
  
  <p>Update: I edited this question to add more details, if possible reopen the questions for answers?!</p>