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I need to have a perl script that can do as follow
1) Backup /var/named --> named_backup.gzip
2) Update all zones SOA refresh to 1200
3) Update all zones SOA expire to 1209600
4) Then insert a new additonal nameserver z entry where nameserver x also exist. If nameserver x doesnt exist the new nameserver z should not be inserted
5) Update serial on all zones
6) Then restart the service - service named restart.
Point 2/3/4/5 should be done one one domain, and then it continues to the next domain, and then 6 when finish with all the domains.