title: How to use awk to delete lines of file1 whose column 1 values exist in file2 in Ubuntu?
body: <p>Say we have file1.csv like this </p>
  
  <pre><code>"agvsad",314
  "gregerg",413
  "dfwer",53214
  "fewf",344
  </code></pre>
  
  <p>and file2.csv like this</p>
  
  <pre><code>"dfwer"
  "fewf"
  </code></pre>
  
  <p>how to use awk to delete those lines whose column 1 values exist in file2 and get a file3 looks like:</p>
  
  <pre><code>"agvsad",314
  "gregerg",413
  </code></pre>
  
  <p>By the way I am dealing with millions of lines</p>