Help scripting dns lookup using awk

Ernie Luzar luzar722 at
Fri Sep 15 23:20:25 UTC 2017

RW via freebsd-questions wrote:
> On Thu, 14 Sep 2017 20:55:00 -0400
> Ernie Luzar wrote:
>> The following sh script works, but runs very slow.
> Almost certainly the reason it's slow is that you are doing sequential
> synchronous lookups. Switching  to another language isn't going help
> much. To speed it up you either need to switch to a language with a
> DNS library that supports asynchronous lookups or fire-off parallel
> child processes. The latter is easier.

How would I go about coding a sh script to fire-off parallel child 

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