System administration command. Interactively submit dynamic DNS update requests to a name server. Use nsupdate to add or remove records from a zone without manually editing the zone file. Commands may be entered interactively or read from filename. An update message is built from multiple commands, some establishing prerequisites, some adding or deleting resource records. Messages are executed as a single transaction. A blank line or the send command will send the current message. Lines beginning with a semicolon are treated as comments. For additional information on dynamic DNS updates, see RFC 2136.
Print additional tracing information usable for debugging.
Read encrypted transaction signature key from keyfile. The key should be encrypted using the HMAC-MD5 algorithm. Keyfiles are generated by the dnssec-keygen command.
Use TCP instead of UDP to send update requests.
Generate transaction signature from specified keyname and secret.
Generate transaction signature from specified keyname and secret. This command overrides command-line options -k or -y.
Use local address and, if specified, port to send updates.
Perform updates only if there are no preexisting records with the name domain-name.
Perform updates only if there are no preexisting records of the specified ...