title: changing multiple filnenames
body: <p>I have a folder with multiple files with the name</p>
  <blockquote>
  <p>author - journal year - title.pdf
  e.g. &quot;Hanahan Weinberg - Cell 2011 - Hallmarks of Cancer The Next Generation.pdf&quot;.</p>
  </blockquote>
  <p>I want to change them all to</p>
  <blockquote>
  <p>year journal - author - title.pdf
  e.g. &quot;2011 Cell - Hanahan Weinberg - Hallmarks of Cancer The Next Generation.pdf&quot;</p>
  </blockquote>
  <p>Is there a way to do this in Mac terminal or in R ?</p>
  <p>Thanks</p>