Possible Duplicate:
Does character 'ä' in usernames cause bugs in linux systems?
Is it possible to create a user with a Unicode login name (and home folder name) ? For instance, in Arch Linux, I try:
$ useradd -d /home/andréas -m -g users -s /bin/bash andréas
useradd: invalid user name 'andréas'
I'm wondering if there's a way to enable such a thing, weither it be with another *nix or some custom kernel compilation.
If it's not possible, why?