title: sed replacement which adds a newline
body: <p>I have string like</p>
  
  <pre><code>990202-1711-BBVRS390-T01
  415715-1611-EDUE818C,1711-EDUE818C
  415715-1611-EDUE818C-,1711-EDUE818C-T01
  </code></pre>
  
  <p>I want to replace all ,  with newline and first 7 character so that the output is</p>
  
  <pre><code>990202-1711-BBVRS390-T01
  415715-1611-EDUE818C
  415715-1711-EDUE818C
  415715-1611-EDUE818C-
  415715-1711-EDUE818C-T01
  </code></pre>