Using wget

wget -q -O – checkip.dyndns.org|sed -e ‘s/.*Current IP Address: //’ -e ‘s/<.*$//’

Using curl

curl -s checkip.dyndns.org|sed -e ‘s/.*Current IP Address: //’ -e ‘s/<.*$//’

curl -s http://whatismyip.org/

Using Lynx

lynx -dump checkip.dyndns.org

lynx -dump www.whatismyip.com | grep ‘Your IP’

Crédito : http://go2linux.garron.me/what-is-my-public-ip-address-with-linux