1）下载真实域名公钥/CA证书文件
echo | openssl s_client -connect trustgate.duckdns.org:443 2>/dev/null | openssl x509 -inform pem
2）下载并显示真实域名公钥/CA证书文件
echo | openssl s_client -connect trustgate.duckdns.org:443 2>/dev/null | openssl x509 -inform pem -noout -text
3）显示证书有效期
# echo | openssl s_client -connect trustgate.duckdns.org:443 2>/dev/null | openssl x509 -noout -enddate
notAfter=Jun 5 09:06:56 2022 GMT
参考：
https://serverfault.com/questions/661978/displaying-a-remote-ssl-certificate-details-using-cli-tools
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本帖最后由 linda 于 2022-3-9 19:05 编辑 ]
