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specified the common default output behavior

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Masataro Asai 2016-01-11 14:44:21 +09:00
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# default behavior for command line output
if some command requires a subcommand and the subcommand is missing, output should be printed as follows:
* auxilary information should be printed to the stderr. These are read by human.
* list of candidates for the missing subcommand should be printed to the stdout. These are not only read by human, but also read by shell completion facility.