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Re: dig: single line



On Wed, 11 Mar 2009 19:46:53 -0430, Patrick O'Callaghan wrote:

> On Thu, 2009-03-12 at 00:13 +0000, Mike -- EMAIL IGNORED wrote:
>> On Wed, 11 Mar 2009 19:31:34 -0430, Patrick O'Callaghan wrote:
>> 
>> > On Wed, 2009-03-11 at 23:32 +0000, Mike -- EMAIL IGNORED wrote:
>> >> The head suggestion won't work, because in the above example, it is
>> >> the second line I want.
>> > 
>> > A trivial excercise for old Shell hands, e.g.
>> > 
>> >         program | head -n 2 | tail -n 1
>> > 
>> > or
>> > 
>> >         program | sed -n 2p
>> > 
>> > poc
>> 
>> Yes, but the dig command sometimes returns the result on the first
>> line, and sometimes on the second, so it is necessary to test what you
>> get.
> 
> You haven't so far said which of the lines you are interested in.
> Perhaps you can use grep on a pattern.
> 
> poc

How about:

   grep "[0-9]+\.[0-9]+\.[0-9]+\.[0-9]"

?
Can it be done more concisely?  Still, one of
the numbers might exceed 255 ... unlikely.

Mike.


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