(Day 8 of 30 Days of Blogging)
Sometimes you need to determine your own IP address. There’s ip addr (the new ifconfig), which
will tell you your local network IP. What about your external Internet-addressible IP? Use this:
dig @resolver4.opendns.com myip.opendns.com +short
This is faster than curl icanhazip.com or equivalent URLs, and more reliable too.