title: Combine many files to a single file INDIVIDUALLY
body: <p>In my directory, I have the following: One constant file (a.txt) &amp; Many other other files (1.txt, 2.txt, 3.txt...etc)</p>
  
  <p>I want to combine a.txt with 1.txt into one file called a_1.txt, I want to combine a.txt with 2.txt into one file called a_2.txt, I want to combine a.txt with 3.txt into one file called a_3.txt,
  and so on. </p>
  
  <p>I've tried using the find command as so:</p>
  
  <pre><code>find ./ -maxdepth 1 -type f -name '*.txt' -execdir cat a.txt {} &gt; receptor_{} \;
  </code></pre>
  
  <p>but does not work, any suggestions?</p>