https://superuser.com/questions/120796/how-to-encode-base64-via-command-line/1236415#1236415 https://manpages.ubuntu.com/manpages/trusty/man1/gen-auth.1.html
// Generate Auth-String with base64
echo -n "Username:Password" | base64
// Generate Auth-String with gen-auth
gen-auth {method} {Username/Email} {Password}