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When I want the fully qualified domain name on Linux, I can write ...

hostname --fqdn

To get the same thing on Solaris, is it necessary to write ...

cut -f 2-3 /etc/hosts | grep ^`hostname`\t | cut -f 2

... or is there something more brief?

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3 Answers

up vote 2 down vote accepted

From here:

The hostname command should return an FQDN...
...
The solution is to edit /etc/nodename and put the FQDN in there and reboot.

    echo foo.your.domain.com > /etc/nodename

You might also be able to use:

getent hosts `hostname` | cut -f 3

or similar.

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Will "getent hosts | cut -f 3" depend on the layout of /etc/hosts ? – Thomas L Holaday Feb 1 '11 at 17:12
@Thomas: Yes. That command retrieves the same field as your command. You could try to use a sed or AWK command to be more flexible and selective. – Dennis Williamson Feb 1 '11 at 18:01
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up vote 2 down vote

Would two digs be better than one?

dig -x `dig +short "$(hostname)"` +short

Just be mindful of the trailing dot.

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up vote 1 down vote

Your method depends upon the /etc/hosts file being formatted in a particular way, on a S10 system I have to hand it returns loghost which is incorrect.

If set up you can ask the DNS system with 

dig -x your.ip.add.ress +short

or if you are using NIS then

echo `hostname`.`domainname`

or you could setup /etc/nodename as Dennis suggests.

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