# IP-adres(sen) van *de* Primary Master (let op syntax)
MASTERS="10.10.10.21; \
         172.16.1.10;"

# Stukje SED om handwerk te besparen
/bin/sed -e '/^\/\//d' \
         -e 's/type master/type slave/' \
         -e '/file/s/\";/.bak";/' \
         -e 's/};/        masters { $MASTERS }; \
};/' \
         -e 's/^\/\/.*//' \
         -e 's/\.zone"/.zone.bak"/' \
         -e '/^$/d' \
$CONF > $WD/someisp.masters-for-slaves.conf \
         || echo "I couldn't create slaves zones" | mail -s \
         "Sed troubles at `uname -a`" admin@sub.domain.tld