解析日期以计算直到Shell脚本中的证书到期为止的天数 [英] parsing the date to calculate days until cert expiry from a shell script

问题描述

我想证明证书过期的日子.使用openssl提取日期很容易

I would like to get the days until a cert expires. Extracting the dates is easy with openssl

> cat cert | openssl x509 -noout -enddate
notAfter=Jun  8 17:07:09 2021 GMT

不幸的是，解析日期 Jun 8 17:07:09 2021 GMT 并找到直到今天的日子并不是那么简单.目标是拥有

Unfortunately parsing the date Jun 8 17:07:09 2021 GMT and finding the days until today is not so straight forward. The goal would be to have

> cat cert | openssl x509 -noout -enddate | ...some commands...
15

这是指证书过期之前的15天.

Meaning 15 days until the cert expires.

我知道openssl -checkend 选项，但这只是一个布尔值，我需要天数.

I am aware of the openssl -checkend option, but that is just a boolean and I want the number of days.

推荐答案

您可以使用以下一个线性脚本:

You may use this one liner shell script:

expiryDays=$(( ($(date -d "$(openssl x509 -in cert -enddate -noout | cut -d= -f2)" '+%s') - $(date '+%s')) / 86400 ))

这是分手:

• openssl ... 命令以 notAfter = ... 格式打印到期日期
• cut -d = -f2 在 =
之后获取文本
• date -d ...'+%s'`:获取到期日的 EPOCH 秒值
• 日期'+％s':获取今天日期的EPOCH秒值
• (epochExpiry-epochToday)/86400 :获取2个EPOCH值之差，以天数为单位

• openssl ... command to print expiry date in notAfter=... format
• cut -d= -f2 to get text after =
• date -d ...'+%s'`: to get EPOCH seconds value for expiry date
• date '+%s': to get EPOCH seconds value for today's date
• (epochExpiry - epochToday) / 86400: to get difference of 2 EPOCH values as number of days

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