title: how to use linux shell pipe rename file?
body: <p>I would like to use shell command line with pipe to rename a file.<br/>
  example: renaming <code>x111.png</code> to <code>my_x111.png</code> (for each file, adding a prefix 'my_')</p>
  
  <p>I know <code>mv xxx bbb</code> is the best way to rename xxx to bbb, but how write the command in shell?</p>