Add legacy +POS/-POS handling in sort to pass GNU sort-field-limit test #9501
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Support GNU’s obsolescent +POS1 [-POS2] syntax by translating it to -k before clap parses args, gated by _POSIX2_VERSION. Adds tests for accept and reject cases to ensure sort-field-limit GNU test passes.
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cakebaker
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Nov 28, 2025
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This change translates GNU’s legacy +POS1 [-POS2] sort key syntax into -k form before clap parsing, gating it by _POSIX2_VERSION to match GNU behavior, and adds by-util tests to ensure acceptance/rejection behavior matches GNU and that the sort-field-limit compatibility test passes.
#9127