https证书有效期检查shell脚本

#!/bin/bash
# 检测https证书有效期

source /etc/profile

while read line; do
echo "====================================================================================="

echo "当前检测的域名：" $line
end_time=$(echo | timeout 1 openssl s_client -servername $line -connect $line:443 2>/dev/null | openssl x509 -noout -enddate 2>/dev/null | awk -F '=' '{print $2}' )
([ $? -ne 0 ] || [[ $end_time == '' ]]) && exit 10

end_times=`date -d "$end_time" +%s `
current_times=`date -d "$(date -u '+%b %d %T %Y GMT') " +%s `

let left_time=$end_times-$current_times
days=`expr $left_time / 86400`
echo "剩余天数: " $days

[ $days -lt 30 ] && echo "https 证书有效期少于30天，存在风险"

done < ./https_list