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get address of specific interface stanza in config file

get address of specific interface stanza in config file

get address of specific interface stanza in config file



I have network interfaces configuration file on debian - with a few stanzas like:

allow-hotplug eth2
iface eth2 inet static

I'd like to extract from this file IP of address attribute of specific interface - for example eth2:

what I have now is:
awk 'BEGIN{RS=ORS="\n\n";FS=OFS="\n"}/eth2/' /etc/network/interfaces|awk '$1=="address"{print $2;exit}'

how to rid of last awk (pipe) and do in one?

RE: get address of specific interface stanza in config file


As far as I know, the iface must occur before the address, so I would toggle a flag when encountering an iface, to tell whether we are after the desired iface instance or not.


awk '$1=="iface"{this=$2=="eth2"}this&&$1=="address"{print$2;exit}' /etc/network/interfaces 

I am not a networking wizard, so there may be situations when this fails. So continuing with your code :


awk 'BEGIN{RS=ORS="\n\n";FS=OFS="\n"}/eth2/{for(i=1;i<=NF;i++)if($i~/^address /){sub(/^address\s*/,"",$i);print$i;exit}}' /etc/network/interfaces 


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