title: awk sum numbers after a separator
body: <p>I need a simple awk to calculate the sum of the number at the end of a file which looks like this:</p>
  
  <pre><code>/z02/ABCD/stuff/ABC_DEF_02/count/ABC_DEF_02_ABCDE66.log.20120605_101201_015.log.gz:28
  /z02/ABCD/stuff/ABC_DEF_02/count/ABC_DEF_02_ABCDE66.log.20120605_101202_015.log.gz:28
  /z02/ABCD/stuff/ABC_DEF_02/count/ABC_DEF_02_ABCDE66.log.20120605_101203_015.log.gz:28
  /z02/ABCD/stuff/ABC_DEF_02/count/ABC_DEF_02_ABCDE66.log.20120605_101204_015.log.gz:28
  </code></pre>
  
  <p>so basically the numbers after the ":" need to be added together</p>