~ wget and grep the json key value ~

# wget -qO- http://freegeoip.net/json/
{“ip”:”8.8.8.8″,”country_code”:”HK”,”country_name”:”Hong Kong”,”region_code”:””,”region_name”:””,”city”:”San Po Kong”,”zip_code”:””,”time_zone”:”Asia/Hong_Kong”,”latitude”:11.11,”longitude”:11.11,”metro_code”:0}

# wget -qO- http://freegeoip.net/json/ | grep -Po ‘(?<=”ip”:”)[^”]*’
8.8.8.8