Hey. (GNU coreutils 8.23) Attached is a file, that, when sort -u'ed in my locale, looses lines which are however unique. I've also attached the locale, since it's a custom made one, but the same seem to happen with "standard" locales as well, see e.g. https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=695489 Cheers, Chris. PS: Please keep me CCed, as I'm writing off list.