title: How to remove the first 2 letters of multiple file names in linux shell?
body: <p>I have files with the names:</p>
  
  <pre><code>Ff6_01.png
  Ff6_02.png
  Ff6_03.png
  ...
  ...
  FF1_01.png
  FF1_02.png
  FF1_03.png
  </code></pre>
  
  <p>I want to remove the first two letters of every file name, because then I would have a correct order of the files. Does anyone know the command in the linux shell?</p>