gem 安装

C:\Documents and Settings\xiaozuo>gem update --system
Updating rubygems-update
Fetching: rubygems-update-1.8.12.gem (100%)
Successfully installed rubygems-update-1.8.12
Installing RubyGems 1.8.12
RubyGems 1.8.12 installed

== 1.8.12 / 2011-12-02

* Bug fix:
  * Handle more cases where Syck's DefaultKey showed up in requirements
    and wasn't cleaned out.

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RubyGems installed the following executables:
        C:/Ruby192/bin/gem

RubyGems system software updated

C:\Documents and Settings\xiaozuo>gem -v
1.8.12