Golfing the Extraction of IP Addresses from ifconfig

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realbrew Permalink
February 20, 2009, 03:17

It's a little tougher to get a WAN address from a router. Here's the best I could do:

traceroute -m 1 -N 1 1.2|grep ms|perl -nle'/\((\S+)/&&print$1'|tr -d \)

Note the fake ip address "1.2" as argument to traceroute.
On another distro, one could leave out the -N 1 option to traceroute, but it's broken in Ubuntu Intrepid and won't do fewer than 6 hops without -N 1.

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