Wednesday, 15 December 2010

sed for dns hackers

(Requires gnu sed)

Moving to a new set of nameservers is a bit like moving house. Lots of stuff thrown away for reasons of unreasonable antiquity, lots of stuff could do with a refresh and cleanup.

sed -i.bak '/\(NS\|SOA\)/ s/\bdns1\.example\.org/; /\(NS\|SOA\)/ s/\bdns2\.example\.org/' master/*

This simple, pretty oneliner fixes NS and SOA records to point to new addresses, and leaves other records alone - unless you have really unfortunate and awkward capital-letter names in your zones. Add some more \b safeguards if so.

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