title: Exclude a string using grep -v
body: <p>I have a requirement to exclude a selected string. I am trying to use <code>grep -v</code> option.</p>
  <p>Input:</p>
  <pre><code>AM2RGHK
  AM2RGHK-JO
  AM2RGHK-FN
  </code></pre>
  <p>Output should be:</p>
  <pre><code>AM2RGHK-JO
  AM2RGHK-FN
  </code></pre>
  <p>From the input list, If I want to exclude only first line, I am using <code>grep -v AM2RGHK</code>
  But I am not getting any output. <code>grep -v</code> excludes all the strings in the same sequence. Any clue?</p>