JDK-8170553 lists:
Add --{help,help-extra,version,full-version,show-version}

We already have: --help, --version, and --full-version

Although --full-version is not documented, it isn't for javac or java commands either.

--help-extra should be added as a synonym for -X

and --show-version should since it continues execution

All output should continue to go to stdout as has been my design which apparently agrees with a discussion between Kumar, Mandy, and Jon.