title: How to randomize file-names with BATCH file command string?
body: <p>I have 1 directory contains 85 *.bmp images. The names of each files looks as following:</p>
  
  <pre><code>1.bmp
  2.bmp
  3.bmp
  4.bmp
  ... (and so on...)
  </code></pre>
  
  <p>I need to automatic randomize file-names, but the names have to be numbers from the 1 to 85 range.
  As result for example 1.bmp can be renamed in 72.bmp, the if I run command string again this 72.bmp can be renamed in 15.bmp. But it couldn't be 86.bmp of 157.bmp, because it's out of range 1 to 85.
  PS
  The names one time can't be the same, of course.</p>
  
  <p>How it could be done with simple windows command prompt and batch file ?</p>
  
  <p>Thanks</p>