Checking the expiry dates of SSL certs

Question

I wrote a script to find the expiry dates of SSL cert in a directory.

shopt -s nullglob
for f in *.0 *.pem *.key *.crt; do
    echo "## CERTIFICATE NAME -> $f ##"
     openssl x509 -noout -in $f   -issuer -subject -dates  
    echo ""
done

Are there any improvements on this?

Answer 1

Please check cmd to get Expected ans :

openssl x509 -noout -text -in abc.cer | grep Not

Output :
        Not Before: Aug 30 10:14:54 2018 GMT
        Not After : Aug 29 10:14:54 2021 GMT

Description : Use your .cer or crt certificate name