newSerial="20$(date +"%y%m%d")09"; for domain in `/bin/ls -1 /var/named/ | grep ".db"`; do echo -n $domain" "; egrep -io "[0-9]{10}.*serial" /var/named/$domain | awk '{print $1}'; done | awk -v newSerial=$newSerial '{ if ( $2 < newSerial ) print $0}' > /var/named/UPDATE_DNS; \
OLDIFS=$IFS; IFS=$'\n'; for zone in `cat /var/named/UPDATE_DNS`; do zoneFile=$(echo $zone | awk '{print $1}'); oldSerial=$(echo $zone | awk '{print $2}'); replace $oldSerial $newSerial -- /var/named/$zoneFile; done; IFS=$OLDIFS; rm -rv /var/named/UPDATE_DNS