The nsupdate command can be used to update dynamic DNS zones, e.g.

> update add 86400 A
>update delete
>update add 86400 PTR
>update delete

N.B. It seems that you have to hit return twice after entering each command to ensure the command is taken

Otherwise you can create a command file and supply this to the nsupdate command, e.g.

cat /var/tmp/dns.out
update add 3600 A

nsupdate -g /var/tmp/dns.out

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