title: How do I get a specific line of a file using 'cat' command?
body: <p>I have a text file with a lot of mda5 hashes. I need to get only the hash of my file as output.  I've tried <code>cat mda5hashes.txt | grep manual12.pdf</code>, but I have this promt:</p>
  
  <pre><code>manual12          917NJvfNj6uY237fjzmso38djr7s
  </code></pre>
  
  <p>How can I get only the hash as prompt, and the number of line in which is located?</p>