title: edit a text file lines by using script in linux
body: <p>I have a file like this below,</p>
  
  <pre><code>#!/bin/bash
  i=1
  export basename=z-4-1_
  </code></pre>
  
  <p>in file "1.bash" I would like to keep as is but in file "2.bash" I would like to change in to z-4-2_ and in file "3.bash" I would like to change in to z-4-3_, and on until I get to 15.</p>
  
  <p>how would like tackle this problem? by using script to modify these numbers in different files. </p>