668e7c0cfdf8cfe0bf545507e8c6bc54e44cbc97
udevadm would dump help() output, instead of printing a message about what is wrong. That's just bad UX. Let's use a different message if the argument is missing, and a different one if it is invalid. Also, rework the code to separate the business logic from argument parsing. Let's not use "default:" in switch statements. This way, the compiler will warn us if we miss one of the cases.
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