Linux in a Nutshell, Fifth Edition

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Chapter 3: Linux Commands

This is the Title of the Book, eMatter Edition

Copyright © 2006 O’Reilly & Associates, Inc. All rights reserved.

nslookup

nslookup

TCP/IP command. Query Internet domain nameservers. nslookup

is deprecated; its functionality is replaced by the dig and host

commands. nslookup may not be included in some distributions.

nsupdate

nsupdate [options] [filename]

System administration command. Interactively submit dynamic

DNS update requests to a nameserver. 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 estab-

lishing 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 informa-

tion on dynamic DNS updates, see RFC 2136.

Options

-d Print additional tracing information usable for debugging.

-k keyfile

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.

-v Use TCP instead of UDP to send update requests.

-y keyname:secret

Generate transaction signature from specified keyname and

secret.

Interactive commands

class classname

Set default class ...