title: how to ignore blank lines and comment lines using awk
body: <p>i am writing this code:</p>
  
  <pre><code>awk -F'=' '!/^$/{arr[$1]=$2}END{for (x in arr) {print x"="arr[x]}}' 1.txt 2.txt
  </code></pre>
  
  <p>this code ignore blank lines, but i also want to ignore line starting with # (comments).</p>
  
  <p>Any idea how to add multiple patterns?</p>