title: How do I add headers into a CSV that does not have one?
body: <p>May sound easy but I can't get it work...</p>
  
  <pre><code>$file = 'D:\TESTING.csv'
  
  Set-Content $file "1,2,3"
  
  $file = import-csv $file -Header a , b , c | export-csv $file 
  
  echo $file
  </code></pre>
  
  <p>Desired output:</p>
  
  <pre class="lang-none prettyprint-override"><code>a b c
  - - -
  1 2 3
  </code></pre>
  
  <p>actual output: </p>
  
  <pre><code>nothing
  </code></pre>