Regarding sort:
`-f'
`--ignore-case'
Fold lowercase characters into the equivalent uppercase characters
when comparing so that, for example, `b' and `B' sort as equal.
The `LC_CTYPE' locale determines character types.
OK, but also document this:
$ echo -e 'A\na'|sort -uf
A
$ echo -e 'A\na'|sort -ufr
A
$ echo -e 'A\na'|sort -urf
A
The man page doesn't say what to expect.
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