title: Where are the simple AWK examples to get started?
body: <p>All of my codes fail. They should print "he", "hello" and "5 \n 3", respectively:</p>
  
  <pre><code>awk -v e='he' {print $e}       // not working, why?
  awk NF { print hello }
  awk { print ARGV[5,3] }
  </code></pre>
  
  <p><strong>Are there some simple examples about AWK?</strong></p>