title: To sum all corresponding fields of 2nd column for each occurrence of fields in the first column
body: <pre><code>$ bpimagelist -l -d 11/01/2013 03:27:13 -e 11/01/2013 03:30:00 | awk '/^IMAGE/ {print $2, $19}'
  
  XXclcnpde148-bak.XX 11808
  
  XXclnXXcXXcde010-bak.XX 26400
  
  XXcwcnpde148-bak.XX 1623072
  
  XXcwcnpde207-bak.XX 672
  
  XXcwcnpde207-bak.XX 672
  
  XXcwcnpde209-bak.XX 672
  
  XXcwcnpde209-bak.XX 672
  
  XXcwcnpde209-bak.XX 672
  
  -
  -
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  - and continues
  </code></pre>
  
  <p>My output has 2 columns, i need an awk linux command to sum all corresponding fields of 2nd column for each occurrence of fields in the first column. Then  print unique values of column 1 and its corresponding sum in column to.</p>