title: Shell script to check if file A or B is presen in a directory
body: <p>How to check if either file-A or file-B is present in a directory?</p>
  
  <p>The script to check the existence of file-A is as follows:</p>
  
  <pre><code>#!/usr/local/bin/bash
  
  if [ -e "/home/usr/file-A.txt" ]; then 
       echo "INFO: file-A is present" 
  else 
       echo "INFO: file-A is not present"
  fi
  </code></pre>
  
  <p>What are the required modifications?</p>