title: Grep for next blank line after line number
body: <p>I have a large file which contains tables of different tab separated data. The different tables are separated by a blank line.</p>
  
  <p>I have the line number of the start of a particular table and I need to retrieve the whole table.</p>
  
  <p>How can I use grep (or something similar) to get the line number of the next blank line after a specific line number?</p>