title: Rename small part of multiple files in middle of name using Bash?
body: <p>I'd just like to change this</p>
  
  <pre><code>cc211_AMBER_13062012i.II  cc211_GROMOS_13062012i.II
  cc211_CHARM_13062012i.II  cc211_OPLS_13062012i.II
  </code></pre>
  
  <p>to</p>
  
  <pre><code>cc211_AMBER_15062012i.II  cc211_GROMOS_15062012i.II
  cc211_CHARM_15062012i.II  cc211_OPLS_15062012i.II
  </code></pre>
  
  <p>I tried,</p>
  
  <pre><code>find -name "*.13 *" | xargs rename ".13" ".15"
  </code></pre>
  
  <p>There is normally no space between the 3 and the second asterix, thats just makes it italics on from what I can see. Basically there's a lot of answers for what to do when it's at the end of the filename, where asterix seem to work, but here I can't make it work.</p>
  
  <p>Anything you've got would make my life a lot easier!</p>
  
  <p>Edit 1: Trial</p>
  
  <pre><code>-bash-4.1$ ls
  
  cc211_AMBER_13062012.II  cc211_GROMOS_13062012.II
  cc211_CHARM_13062012.II  cc211_OPLS_13062012.II
  
  -bash-4.1$ rename 's/_13/_15/' cc*
  -bash-4.1$ ls
  
  cc211_AMBER_13062012.II  cc211_GROMOS_13062012.II
  cc211_CHARM_13062012.II  cc211_OPLS_13062012.II 
  </code></pre>