How to check SSL certificate expiration time through shell script

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In this blog we will learn "How to check SSL certificate  number of days for expiration of our domain"

I am going to show here in a Linux environment by using Shell script.

 Create file by the name checkssl.sh

- sudo nano checkssl.sh

Code- Copy this code and save file.

data=`echo | openssl s_client -servername $1 -connect $1:${2:-443} 2>/dev/null | openssl x509 -noout -enddate | sed -e 's#notAfter=##'`

ssldate=`date -d "${data}" '+%s'`

nowdate=`date '+%s'`

diff="$((${ssldate}-${nowdate}))"

echo $((${diff}/86400))

Output- You will get result as below



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