- ssl config generator : to get, check the best up to date ssl configuration for your http server
openssl x509 -in key.pem -text
openssl rsa -in ~/.ssh/id_rsa -text
openssl s_client -showcerts -connect www.example.com:443
awk -v cmd='openssl x509 -noout -subject' '
/BEGIN/{close(cmd)};{print | cmd}' < /etc/ssl/certs/ca-certificates.crt