title: Using sed to combine multiple csv files
body: <p>I have 3 csv files I'd like to combine. Each file has 3 comma delimited columns.</p>
  
  <pre><code>File 1 has columns a,b,c
  File 2 has columns d,e,f
  File 3 has columns g,h,i
  </code></pre>
  
  <p>I'd like to combine the 3 files into a single file of:</p>
  
  <pre><code>a,b,c,e,f,h
  </code></pre>
  
  <p>Can I use sed to do that? </p>
  
  <p>I could write a console app or script easily enough but I'm attempting to get some sed skills and believe this should be a suitable task?</p>