nsdiff

The nsdiff program examines the old and new versions of a DNS zone, and outputs the differences as a script for use by BIND's nsupdate program. It provides a bridge between static zone files and dynamic updates. The nspatch script is a wrapper around `nsdiff | nsupdate` that checks and reports errors in a manner suitable for running from cron. The nsvi script makes it easy to edit a dynamic zone.

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