Code:
ex. file1.txt
ar0050046b16,5,888,0,0,0,0.00,0.00,0.00,0.00,25689.55
ar0050046b16,5,0,0,0,0,0.00,0.00,0.00,0.00,25689.55
ar0050046b16,5,0,0,0,0,0.00,0.00,0.00,0.00,25689.55
expected output: file1.txt_Area_by_1
file2.txt
ar0050046b16,5,888,0,0,0,0.00,0.00,0.00,0.00,25689.55
ar0050046b16,5,0,0,0,0,0.00,0.00,0.00,0.00,25689.55
ar0050046b16,5,0,0,0,0,0.00,0.00,0.00,0.00,25689.55
ar0050046b16,5,100,0,0,0,0.00,0.00,0.00,0.00,25689.55
expected output file2.txt_Area_by_2 since $3 has the records of 100