命令
curl "https://tools.keycdn.com/geo.json?host={18.205.6.240}"
返回以下 JSON 文档：
{"status":"success","description":"Data successfully received.","data":{"geo":{"host":"18.205.6.240","ip":"18.205.6.240","rdns":"ec2-18-205-6-240.compute-1.amazonaws.com","asn":14618,"isp":"AMAZON-AES","country_name":"United States","country_code":"US","region_name":"Virginia","region_code":"VA","city":"Ashburn","postal_code":"20149","continent_name":"North America","continent_code":"NA","latitude":39.0469,"longitude":-77.4903,"metro_code":511,"timezone":"America\/New_York","datetime":"2022-06-17 10:44:39"}}}
在此输出中，我需要提取country_name. 我不知道该怎么做。