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Create a duplicate record based on a condition

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http://unix.stackexchange.com – I need to write a shell script where I have to create a duplicate record based on a condition and then change the value in a column of the new row which will be created. I am trying to create a duplicate record based on a condition and then replace on column in the duplicate row. Example: Input will be Col1,Col2,Col3,Col4,COl5 1234,abcd,abcd,wxyz,USD 2345,abcd,abcd,wxyz,USD 3456,abcd,abcd,wxyz,EUR If the last column ie; col5 is EUR, then one more row should be created with change in column value. Output should be Col1,Col2,Col3,Col4,Col5 1234,abcd,abcd,wxyz,USD 2345,abcd,abcd,wxyz,US (HowTos)