Unable to install rails on jRuby

Question

What I have installed until now is:

1. Latest JDK and JRE (version 7 update 6)
2. jRuby 1.7.0 preview 2

and successfully tested them.

Then I try the following command:

jruby -S gem install -y rails

and get the following error:

ERROR: While executing gem ... <RuntimeError>
    Unknown command itall

Please advice, what I have to do in order to install rails on jruby. My OS is windows pro (32 bits).

EDIT: Also note that I have not install any other thing - Ruby for example.

Answer 1

Removing the '-y' part of the command fix the issue.