title: Combining several text files in a comparative way
body: <p>1st time posting, so please be patient with me...
  I have a list of names and several different files ( ~ 600) that may or may not contain all the names on the list and a value assigned to the names. I need to compare all these values from each file to the names on the list. These are the type of txt files I have</p>
  
  <p>List</p>
  
  <pre><code>Alligator mississippiensis
  Anas platyrhynchos
  Anolis carolinensis
  Chrysemys picta
  Columba livia
  Gallus gallus
  </code></pre>
  
  <p>File1</p>
  
  <pre><code>Alligator mississippiensis 2546
  Anas platyrhynchos 32
  Columba livia 21571
  Gallus gallus 226
  </code></pre>
  
  <p>File2</p>
  
  <pre><code>Anas platyrhynchos 2
  Anolis carolinensis 3255
  Chrysemys picta 225
  Columba livia 2215
  Gallus gallus 22548
  </code></pre>
  
  <p>And this is the output I am looking for, where the header would be the name of the files.</p>
  
  <pre><code>List File1,File2
  Alligator mississippiensis 2546,0
  Anas platyrhynchos 32,2
  Anolis carolinensis 0,3255
  Chrysemys picta 0,225
  Columba livia 21571, 2215
  Gallus gallus 226, 22548
  </code></pre>
  
  <p>I thought something like grep the strings on the list and if find, print column 2 from File*, and append consecutively, and if not find the string on the list, print 0.</p>