title: search for multiple words in file
body: <p>If I wish to search for occurrence of a word in a file using grep I use</p>
  
  <pre><code>grep token file
  </code></pre>
  
  <p>what if I wish to search for lines where it contains multiple tokens, pseudo code:</p>
  
  <pre><code>grep "token1 and token2" file
  </code></pre>
  
  <p>how can this be done?</p>