一个查看域名ssl认证有效期的脚本

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server_name=$1
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# 获取网站的证书有效期
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ssl_time=$(echo | openssl s_client -servername ${server_name}  -connect ${server_name}:443 2>/dev/null | openssl x509 -noout -dates|awk -F '=' '/notAfter/{print $2}')
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# 转换时间戳
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ssl_unix_time=$(date +%s -d "${ssl_time}")
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# 获取今天时间戳
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today=$(date +%s)
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# 计算剩余时间
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let  expr_time=($ssl_unix_time-$today)/24/3600
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echo "${server_name} : SSL Certification Expired in $expr_time days. "