Linux in a Nutshell, Fifth Edition

hostname | 207

Linux

Commands

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

-n Perform reverse lookups for IPv6 addresses using IP6.INT

domain and “nibble” labels instead of IP6.ARPA and binary

labels.

-r Do not ask contacted server to query other servers, but require

only the information that it has cached.

-t type

Look for type entries in the resource record. type may be any

recognized query type, such as A, AXFR, CNAME, NS, SOA,

SIG, or ANY. If name is a hostname, host will look for A

records by default. If name is an IPv4 or IPv6 address, it will

look for PTR records.

-v Verbose. Include all fields from resource record, even time-to-

live and class, as well as “additional information” and

“authoritative nameservers” (provided by the remote

nameserver).

-w Never give up on queried server.

-C Display SOA records from all authoritative nameservers for

the specified zone.

-N n

Consider names with fewer than n dots in them to be relative.

Search for them in the domains listed in the search and

domain directives of /etc/resolv.conf. The default is usually 1.

-R n

Retry query a maximum of n times. The default is 1.

-T Use TCP instead of UDP to query nameserver. This is implied

in queries that require TCP, such as AXFR requests.

-W n

Wait a maximum of n seconds for reply.

hostid

hostid

Print the ID number in hexadecimal of the current host.

hostname ...