is it possible to append new data to a CSV file, but only add the new information ?
for exp
the existing CVS file has 1,2,3,4 then the new file has 1,2,3,4,5. I really would like 1-4 to remain unchanged but 5 is add. as well as if the CVS file has 1,2,3,4 in it and the source of the CSV file no longer has 2 in it , I would like 2 to remain on the CSV and any new information to still be added