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> Ah, I didn't think that isprint and iscntrl would be mutually exclusive.
> Bother. Personally I think I'd fix my locale. Or do something ugly like have
> my own iscontrol test that did n < 32.

Further to this, trying iscntrl on a few top-bit-set characters in my normal
locale (en_GB) and what I presume is yours (pt_BR) gave "0" under RedHat
7.1. Hmm...

-- | computation, n.  automated pedantry