title: Difference between ps -e and ps -A
body: <p>I was going through the help page of ps command (using ps --h) and I noticed the two options have the same description. </p>
  
  <pre><code>-e all processes
  -A all processes
  </code></pre>
  
  <p>I ran the commands with both the options and I noticed no difference. </p>
  
  <p>Is there any difference between the two options? If not why to provide two options that does the same?</p>