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Adithya Das
Adithya Das

Reputation: 33

How to extract all ifconfig data in awk except loopback

I am writing a script which includes a function to list all interfaces EXCEPT loopback from ifconfig. The logic I'm using is to look for the loopback block by a regular expression and negating it. The command i use is ifconfig|awk '!/lo:/,/\n\n+/' but this is still returning all the interfaces. When i remove the !, only the loopback address is returned. Then why is the earlier command returning everything instead of everything except loopback?

Upvotes: 0

Views: 199

Answers (1)

sat
sat

Reputation: 14949

You can use this awk:

ifconfig | awk 'BEGIN{ORS=RS="\n\n"} !/^lo/{print}'

Upvotes: 3

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