On Thu, Dec 19, 2024 at 1:25 PM Grant Taylor via bind-users <
bind-users@lists.isc.org> wrote:
> Hi,
>
> I'd appreciate some help in getting just the PTR record from the
> following dig command:
>
> dig +short -x 192.0.2.1
>
> With the following germane content from the respective zones:
>
> 1.2.0.192.in-addr.arpa. IN CNAME nic.host.example.net.
>
> nic.host.example.net. IN PTR host.example.net.
> nic.host.example.net. IN A 192.0.2.1
> host.example.net. IN A 192.0.2.1
>
> When I run the dig command above, I get two lines of output:
>
> nic.host.example.net.
> host.example.net.
>
> I'm looking at scripting the collection of the value of the PTR record;
> host.example.net. But my old method of "$(dig +short -x 192.0.2.1)"
> isn't compatible with the RFC 2317 Classless IN-ADDR.ARPA Delegation /
> CNAME method. As such, I'm looking to update it.
>
> Is there another -- hopefully -- simple command that I can run to get
> just the PTR value?
>
> I took a look at `drill` and it seems to do similar and comes with it's
> own complications.
>
> The venerable `host` also seems to produce multiple lines of output.
>
> Or am I looking at something to post-process the output from dig et al.
> or my own custom utility (Perl / Python code) to use beside dig et al.?
>
>
I typically use something like:
dig +noall +ans -x 192.0.2.1 | awk '$4 == "PTR" {print $5;exit}'
That returns only the first PTR record if there are more than one.
--
Bob Harold
> --
> Grant. . . .
> unix || die
> --
>
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