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    >28 million tab-delimited records. I agree that doing it outside of emacs might be the better move, especially since the file is so large. Commented Dec 20, 2022 at 4:34
  • Agreed, cut is all you need here. Otherwise awk or perl should also be pretty fast. You want to use the (or a) right tool for the job, which is definitely not Emacs for this quantity of text (it can do it, but it will be sloooow by comparison). Commented Dec 20, 2022 at 4:45