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Now, this problem has been solved umpteen times in these fora. Try searching relevant threads and adapting the given solutions. You may start with the links at this page's lower left under "More UNIX...

Your result is a bit surprising as the proposal has been tested and found to work, as you can see in post#2.
What you show in post#3 lets me suspect you have DOS line terminators (^M, 0x0D, \r,...

It's by sheer coincidence that you get anything from that code snippet. The field separator should be set to comma, but due to an incorrect syntax it isn't. The a array holds one single element...