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sorry for not explaining with detail but i was busy at the moment, you can solve this with a single command like this:
1) if your text file has numbers separated by several spaces
123 456 789
the first thing to do is make them be separated by one space like this:
cat new.txt | tr -s ' '
that command line sends the contents of the file new.txt into the command tr (piping) and tells tr to squeeze the spaces together. now you either redirect the output to a temporary file or you can redirect it to tr again like this:
cat new.txt | tr -s ' ' | tr ' ' ','
the second pipe sends the output of the squeezed together numbers and tells tr to change all the single spaces to commas.