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How to Install Ruby and RubyGems

http://docs.cloudfoundry.com/frameworks/ruby/installing-ruby.html#windows

Windows

Download and install Ruby Installer for Windows. The installer already includes RubyGems.

Be sure you use the Ruby-enabled command prompt window when you later install and use vmc. You access this command prompt from the Windows Start menu (All Programs > Ruby > Start Command Prompt with Ruby).

Finally, update RubyGems from the Ruby Command Prompt:

prompt> gem update --system

ruby 1.9.3p194 (2012-04-20) [i386-mingw32]

C:\Users\Thai Hau>gem update --system
Updating rubygems-update
Fetching: rubygems-update-1.8.24.gem (100%)
Successfully installed rubygems-update-1.8.24
Installing RubyGems 1.8.24
RubyGems 1.8.24 installed

== 1.8.24 / 2012-04-27

* 1 bug fix:

  * Install the .pem files properly. Fixes #320
  * Remove OpenSSL dependency from the http code path


-------------------------------------------------------------

RubyGems installed the following executables:
        D:/Ruby193/bin/gem

RubyGems system software updated

Installing vmc: Procedure
http://docs.cloudfoundry.com/tools/vmc/installing-vmc.html#installing-vmc-procedure

On Windows, open a command prompt in which Ruby is enabled and execute the following:

prompt> gem install vmc
Execute the vmc target command to specify the Cloud Foundry target to which you will deploy your applications:

To deploy on the PaaS Cloud Foundry, specify api.cloudfoundry.com
To deploy on your local Micro Cloud Foundry, specify api..cloudfoundry.me, where appname is the domain you registered for your application at the Micro Cloud Foundry Web site. See Installing Micro Cloud Foundry.
The following command targets the PaaS Cloud Foundry:

prompt$ vmc target api.cloudfoundry.com
To determine your current target, execute the `vmc target` command without any parameters:
prompt$ vmc target
Login using the user credentials you received via email after you registered with Cloud Foudnry. Your username is typically your email address.
prompt$ vmc login
Ensure you have successfully logged in by retrieving information about your account:
prompt$ vmc info
Change your password:
prompt$ vmc passwd
View the full list of VMC commands, along with their parameters and a brief description, by executing the vmc help command:
prompt$ vmc help
You have now successfully installed vmc and run a few basic commands.