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Another simple way to get external IP or use:
wget -qO- http://ipecho.net/plain
There are 6 alternatives - vote for the best!
Short command, easy to remember
Instead of opening your browser, googling "whatismyip"...
Also useful for scripts.
dig can be found in the dnsutils package.
Yeah I know it's been up here a million times, but this service is a really clean and nice one. Nothing but your IP address on it. Actually I was to write something like this, and noticed this on appspot... ;)
If you can do better, submit your command here.
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