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What sorting algorithm(s) is/are used in the unix sort command? Insertion/quicksort/etc.?

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up vote 8 down vote accepted

If you are referring to GNU sort, it implements a variant of the merge sort algorithm.

The coreutils are open source, so feel free to download them and take a look.

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The relevant POSIX standard doesn't dictate what algorithm to use, so implementations are free to choose what they like.

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