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Try
awk -F, '
{i = 0
MX = split ($2, T, "]") - 2
while (i <= MX) {OUT = $1 OFS SQ
while ((length (OUT T[i+1]) < 255) && (i <=...

You didn't answer the question about what shell you're using. The following was written and tested using a Korn shell, but should work with any shell that is based on Bourne shell syntax (e.g., ash,...

So - what (except for the strange, non-existing - but not hurting - $4) don't you like with your own approach?

As RudiC said, it looks like:
awk '{a[$1" "$2]+=$3+$4}END{for (i in a){print i,a[i]}}' filename
should work, but since there are only 3 fields in any of your input lines, you should get the same...

Your input file must have had carriage returns in the first place. Oh well.