nsrecord
The ‘nsrecord’ is a helper script for those who are not interested in following the full beauty of nsupdate syntax.
The syntax is rather simple:
nsrecord add ZONE RTYPE RR RDATA
nsrecord del ZONE RTYPE RR RDATA
nsrecord delete ZONE RTYPE RR RDATA
Real-life examples would look thus:
nsrecord add microsoft.com MX microsoft.com 10 mx.google.com
nsrecord add google.com TXT google.com "Facebook Rules The World."
nsrecord add facebook.com A aaghraa 127.0.0.1
nsrecord del facebook.com A aaghraa.facebook.com. 127.0.0.1
nsrecord delete google.com TXT google.com "Facebook Rules The World."
The zone names are treated as qualified, but the RRs aren't – mind the dots after the RRs, because any unqualified records will have the zone name appended automatically. Record data is treated ‘as-is’.
The utility sets reasonable prerequisites automatically, and makes sure that you're not trying to delete any non-existing records.
On the server side the zone has to be configured for automatic updates and the key used by the utility has to be allowed to make necessary changes on the bind server.