The output of locale seems to distinguish between upper and lowercase:
% locale -a
C
en_AU.utf8
en_US.utf8
POSIX
Almost everywhere else in the wild seems to use the uppercase .UTF8, however glibc normalises locales to lowercase, and comments:
There is no standard for the codeset names.
What is the standard that defines the form <language>_<country>.<codeset>? Is it really silent on code page capitalisation?
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Author: Tom Hale