regex - How to extract all ifconfig data in awk except loopback -

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i writing script includes function list interfaces except loopback ifconfig. logic i'm using loopback block regular expression , negating it. command use ifconfig|awk '!/lo:/,/\n\n+/' still returning interfaces. when remove !, loopback address returned. why earlier command returning instead of except loopback?

you can use awk:

ifconfig | awk 'begin{ors=rs="\n\n"} !/^lo/{print}'

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