You can save all the keys by storing /etc/openvpn/easy-rsa/keys, and
the script will not generate them if it sees they exist already.
+For future updates to this script, this is a good place to
+take inspiration.
+https://github.com/angristan/openvpn-install/blob/master/openvpn-install.sh
+
Note: Uses GNU getopt options parsing style
EOF
exit $1