title: Find common lines between two files and also their line number
body: <p>I want to find common lines between two files(large ones), one with 90 million lines and 1 with 100 thousands and also their line number.</p>
  
  <pre><code>comm -12 file1 file2
  </code></pre>
  
  <p>gives me the common lines, but I want to know the line number from the individual files as well</p>