title: grep OR command not working unix solaris
body: <p>I able to do single grep but can not do OR search in unix solaris</p>
  
  <p>Please see below examples i tried...</p>
  
  <pre><code>-bash-3.00$ echo "Hello hi" | grep -i "Hello"
  Hello hi
  -bash-3.00$ echo "Hello hi" | grep -i "Hello\|hi"
  -bash-3.00$ 
  </code></pre>