title: want to use linux command in awk command
body: <pre><code> awk -F, '{"date -d \"$1\" +%s"|getline b;{print $1 "," b} }' test.csv
  </code></pre>
  
  <p>Above is my <code>awk command</code>, I wanted to use input from file and convert that into milliseconds. but when i used it it show me the current date conversion in milliseconds rather than conversion for particular input from the file.</p>
  
  <p>this is my file data;- test.csv</p>
  
  <pre><code>31-JAN-2012
  06-JUL-2009
  03-OCT-2011
  03-OCT-2011
  03-OCT-2011
  03-OCT-2011
  03-OCT-2011
  </code></pre>