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Also let us know if (as in your example) all occurrences of a given value in field 1 are on contiguous lines in your input text file.

And, please use CODE tags when posting code segments, sample...

With awk this is straightforward:
awk '{A[$1]+=$3} END{for(i in A) print i,A[i]}' FS=, OFS=, file
You can call this from ksh.

If you want to do this in ksh only, can you post what you have tried...