Test TLS 1.0, 1.1, 1.2 connection

listtls.sh

# brew install coreutils

function listtls() {
  timeout 3 openssl s_client -connect "$1:443" -servername "$1" -tls1 < /dev/null > /dev/null 2>&1 && echo -n 1 || echo -n 0
  timeout 3 openssl s_client -connect "$1:443" -servername "$1" -tls1_1 < /dev/null > /dev/null 2>&1 && echo -n 1 || echo -n 0
  timeout 3 openssl s_client -connect "$1:443" -servername "$1" -tls1_2 < /dev/null > /dev/null 2>&1 && echo -n 1 || echo -n 0
#  timeout 3 openssl s_client -connect example.com:443 -tls1_3 < /dev/null > /dev/null 2>&1 && echo -n 1 || echo -n 0
  echo ", $1"
}