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$ touch ¿
$ ls ? > zz
...
xx not renamed: ¿ already exists
$ rename --version
/usr/bin/rename using File::Rename version 1.13, File::Rename::Options
+ version 1.10

$ perl -e 'use utf8; print "¿\n"' > ww
$ xxd ww
...
$ perl -e 'use utf8; $c="¿\n"; utf8::upgrade($c); print $c' > vv
$ xxd vv
00000000: bf0a

$ perl -e 'print "¿\n"' > uu
$ xxd uu
...

$ curl --silent --head 'http://localhost/' | grep 'Content-Type'
Content-Type: text/html; charset=utf-8