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For TSV, coreutils, awk, etc are nice to work with for sure but for CSV not so much.

awk -F, ?

Until you start dealing with quotes.

perl -MText::CSV will take care of that.

At the risk of being flippant: sed 's/,/\t/g'

And hope you don't have any commas into your data?

In my line of work, that's an excellent assumption.

Must be nice to start work with clean data. Allow me to assure you that there are many, many others who don't have the luxury.