title: Comparing two columns in different file and printing match if difference between record in a columns less than or equal to 0.001
body: <p>I have two text files, say file1.txt contains something like </p>
  
  <pre><code>100.145 10.0728
  100.298 10.04
  100.212 10.0286
  </code></pre>
  
  <p>and file2.txt contains something like </p>
  
  <pre><code>100.223 8.92739
  100.209 9.04269
  100.084 9.08411
  </code></pre>
  
  <p>I want to compare column 1 and column 2 of both files and print match
  if the difference of both columns in file1.txt and in file2.txt is less or equal to 0.001.</p>