What have you tried? What worked? See How do I post a question effectively?. Questions such as this should be posted as independent questions/new threads since they are not pertinent to the immediate conversation.

If you post your code that reads in your CSV, I can help you sort it. Without that info, your question is ill-defined.

#11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.

In reply to Re^3: sort a csv file then updta the same file by kennethk
in thread sort a csv file then update the same file by john.tm

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