newbie question(file-delete trailing comma)

[kavitha thankaian]

hi,
   
  i have a file which has the contents as follows:
   
  a,b,c,d,
  a1,b1,c1,d1,
  a2,b2,c2,d2,
   
  i would like to delete all the trailing commas,,
   
  if someoneknows pls help me,,
   
  kavitha

 				
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