# Character ranges in a locale other than the POSIX locale, not specified
# by POSIX.

unset LC_ALL
LC_CTYPE=de_DE.ISO8859-1
export LC_CTYPE
LC_COLLATE=de_DE.ISO8859-1
export LC_COLLATE

c1=e
# o umlaut
c2=$(printf '\366')

case $c1$c2 in
[a-z][a-z]) ;;
*) echo wrong at $LINENO ;;
esac

case $c1$c2 in
[a-f][n-p]) ;;
*) echo wrong at $LINENO ;;
esac