title: Zcat with lines' indexes
body: <p>How can I see the indexes of lines with zcat? 
  I tried to find a flag of zcat, but didn't find one that show lines' numbers.</p>
  
  <p>Example:
  My file contains these lines:</p>
  
  <pre><code>Hello everybody!
  aaa bbb
  aaa Hello
  </code></pre>
  
  <p>What I want to get from this command:</p>
  
  <pre><code>zcat file | grep Hello
  </code></pre>
  
  <p>Is:</p>
  
  <pre><code>1 Hello everybody! 
  3 aaa Hello
  </code></pre>
  
  <p>Any ideas?
  Thanks!</p>