Selecting lines from stdin based on content of preceding line

I previously wrote a very simple but handy shell script wrapper for
nslookup which used awk and extracted the

Name:
Address{es}:

lines and worked very well but I now have to run this on a machine where
nslookup gives the server address as well as the target address such as:

C:\>nslookup 192.168.1.1
Server:  ns0.zen.co.uk
Address:  212.23.8.1

Name:    my.router
Address:  192.168.1.1

I am matching for "Address" but don't want the second line of the above.
Can awk be told to ignore this line if it reads "Server:" on the
preceding line?

TIA

James Harris
>
>     C:\>nslookup 192.168.1.1
>     Server:  ns0.zen.co.uk
>     Address:  212.23.8.1
>
>     Name:    my.router
>     Address:  192.168.1.1
>
> I am matching for "Address" but don't want the second line of the
above.
> Can awk be told to ignore this line if it reads "Server:" on the
> preceding line?

Yes.
awk "/Name:/{a=$0}/Address:/ && a {print a\"\n\"$0;a=0}"
Awk is powerful but it is not the only choice:
In Sed:
gsed -n "/Name:/{N;p}"
Or in grep
grep -A1 Name:

_____
hq00e

James Harris wrote:
> I previously wrote a very simple but handy shell script wrapper for
> nslookup which used awk and extracted the
>
>     Name:
>     Address{es}:
>
> lines and worked very well but I now have to run this on a machine where
> nslookup gives the server address as well as the target address such as:
>
>     C:\>nslookup 192.168.1.1
>     Server:  ns0.zen.co.uk
>     Address:  212.23.8.1
>
>     Name:    my.router
>     Address:  192.168.1.1
>
> I am matching for "Address" but don't want the second line of the above.
> Can awk be told to ignore this line if it reads "Server:" on the
> preceding line?

It sounds like all you need to do is:

awk '/Name/,/Address/'

Regards,

Ed.

Ed Morton  =E5=86=99=E9=81=93=EF=BC=9A
> It sounds like all you need to do is:
>
> 	awk '/Name/,/Address/'
>
> Regards,
>
> 	Ed.

Hey, what...
how dare you...
.=2E..........
Very enlightening!
Everyone who peep the answer would/should
say I should have known the answer...but
they just can't find the answer before they
know it.
Commonly people learn sth new and forget
good-old-basic and basic one.

It is "=E7=A6=85" in Chinese.

I should have known that!
_____
hqQQe