title: In place shift in a string
body: <p>I want to convert below text file:</p>
  
  <pre><code>4100,123.45-,6789.66-
  4152,1234.11,6789.11
  </code></pre>
  
  <p>(And many more records)</p>
  
  <p>To </p>
  
  <pre><code>4100,-123.45,-6789.66
  4152,1234.11,6789.11 
  </code></pre>
  
  <p>Note that the input file have minus sign at the end of the number, I would like to correct it using Linux command.</p>
  
  <p>Please help...</p>