title: Delete lines based on patterns in another file
body: <p>I have two files:</p>
  
  <p><code>input.txt</code>:</p>
  
  
  
  <pre class="lang-none prettyprint-override"><code>Hi 1-12T2EDD
  1-13D62L6Hello
  1-15SDWAKWazzup
  Wow1-18Z3QWY
  </code></pre>
  
  <p><code>filter.txt</code>:</p>
  
  <pre class="lang-none prettyprint-override"><code>1-15SDWAK
  1-1VF3XHV
  </code></pre>
  
  <p>I want to delete lines with matching pattern from <code>filter.txt</code> in <code>input.txt</code>. In SQL understanding, I want to do left outer join <code>input.txt</code> with <code>filter.txt</code>.</p>
  
  <p><code>output.txt</code>:</p>
  
  <pre class="lang-none prettyprint-override"><code>Hi1-12T2EDD
  1-13D62L6Hello
  Wow1-18Z3QWY
  </code></pre>