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seq: return exit 2 (misuse) for invalid flags, matching POSIX convention for argument errors. cut: accept spaces as range list separators (e.g., -b '1 3 5'), matching GNU behavior. tr: return exit 1 (general_error) for extra operands, matching GNU behavior.
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Summary
--invalid-flag, matching POSIX convention for argument errors-b '1 3 5'), matching GNU behaviorTest plan
just it-util seq— 19/19 passedjust it-util cut— 70/70 passedjust it-util tr— 54/54 passedzig build test— 1984 passed, 27 skipped