Follow-up Comment #2, bug #64100 (project findutils):
It might also be useful to allow the user to specify how the program should
respond if a format specifier is
(1) unknown to the implementation
(2) known to the implementation but not supported on the platform
(3) supported on the platform but not retrievable (example: AFS provides
sufficiently granular permissions that you can have only some metadata
accessible; similarly on Unix it can be possible to count the subdirectories a
directory has but not the files).
Possible responses might include (a) failing immediately, (b) printing spaces
or (c) printing nothing and ensuring that the final exit status is nonzero.
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