Digging to the final IP
LuKreme
kremels at kreme.com
Wed Oct 22 22:58:03 UTC 2014
> On 21 Oct 2014, at 22:46 , Jim Young <jyoung at gsu.edu> wrote:
>
> On 10/22/14 12:08 AM, "LuKreme" <kremels at kreme.com> wrote:
>
>>> On 21 Oct 2014, at 19:20 , Dave Knight <dave at knig.ht> wrote:
>>>
>>> $ dig +noall +answer dave.knig.ht in a | egrep 'IN\tA\t' | cut -f6
>>> 216.235.14.46
>>
>> Interesting. This works for me:
>>
>> dig +noall +answer home.kreme.com in a | egrep '\tA' | cut -f5
>>
>> but on your example, it requires -f6
>>
>> And yet, the outputs appear to have the same number of fields.
>>
>> $ dig +noall +answer www.kreme.com in a
>> www.kreme.com. 21139 IN CNAME cerebus.kreme.com.
>> cerebus.kreme.com. 21141 IN A 23.24.150.141
>> $ dig +noall +answer dave.knig.ht in a
>> dave.knig.ht. 13916 IN CNAME sb.sanxion.org.
>> sb.sanxion.org. 222 IN A 216.235.14.46
>>
>> Very odd.
>
> Subtle formatting difference for human consumption. There are a variable
> number of ASCII TABs inserted to visually align fields.
Yeah, I saw the extra space after 222, but did not check for a second tab following sb.sanxion.org.
> This is where output generated for human consumption can be tricky to
> parse.
That’s why I like dig +short
--
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