title: for i in `cat file` type with 2 variables and 2 files
body: <p>i have this script</p>
  
  <pre><code>for i in `cat file`
  do
  echo $i
  done
  </code></pre>
  
  <p>how can i have in same loop 2 variables from 2 different files</p>
  
  <p>to get </p>
  
  <pre><code>echo $i + $f
  </code></pre>