title: Identify the files opened a particular process on linux
body: <p>I need a script to identify the files opened a particular process on linux</p>
  
  <p>To identify fd : </p>
  
  <pre><code>&gt;cd /proc/&lt;PID&gt;/fd; ls |wc –l  
  </code></pre>
  
  <p>I expect to see a list of numbers which is the list of files descriptors' number using in the process. Please show me how to see all the files using in that process. 
  Thanks.</p>