title: Detecting duplicate lines on file using c
body: <p>I have a csv file with about (15000-25000) lines(of fixed size) and i want to know how can i detect duplicated lines using c language.</p>
  
  <p>An example of the output is like this :</p>
  
  <pre><code>0123456789;CUST098WZAX;35
  </code></pre>
  
  <p>I have no memory or time constraint, so i want the simplest solution.</p>
  
  <p>Thanks for your help.</p>