user="$(sed -n '/^[a-z]/{p;q;}' /etc/userv/dyndns-service-users)"
if [ "$user" ]; then
- adduser --system --quiet --group --gecos 'userv dyndns' \
+ adduser --system --force-badname --quiet --group \
+ --gecos 'userv dyndns' \
--home /etc/userv --no-create-home --shell /bin/false $user
fi