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For 2.: Your phrasing doesn't target the right question. We're dealing with two things:

a) the -v option to awk, which you correctly deploy for the passing of the d variable. man awk:


b)...

The result you present is not quite reproducible. -OFS="," causes an error, but when corrected like -vOFS="," , it should yield the desired output without space. You could even simplify your code...