如何正确地使用ruby和命令行工具在小牛中安装cocoapod？

小牛队10.9.1
Xcode 5.0.2
哪个ruby返回这个：

/Users/quique123/.rvm/rubies/ruby-1.9.3-p194/bin/ruby

但是dvm install ruby??返回：

Already installed ruby-2.1.0.
To reinstall use:

    rvm reinstall ruby-2.1.0

所以这不意味着我有ruby 2.1.0吗？

宝石列表说我已经安装了可可豆荚和cocoapods-core 0.29.0和其他一些宝石.

在sudo gem安装可可豆荚之后,我获得了一堆提取并更改了日志和成功安装的可可豆荚0.29.0.然后解析并安装文档,当我运行pod setup时,我得到了：

Setting up CocoaPods master repo
Setup completed (read-only access)

所以我从教程中创建了一个文件：

platform :iOS,'7.0'
pod 'Mantle'
pod 'TSMessages'
pod 'ReactiveCocoa'

但是当我运行pod安装时,我得到：

/Users/myusername/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/site_ruby/1.9.1/rubygems/dependency.rb:298:in `to_specs': Could not find 'cocoa pods' (>= 0) among 37 total gem(s) (Gem::LoadError)
    from /Users/quique123/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/site_ruby/1.9.1/rubygems/dependency.rb:309:in `to_spec'
    from /Users/quique123/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/site_ruby/1.9.1/rubygems/core_ext/kernel_gem.rb:53:in `gem'
    from /Users/quique123/.rvm/rubies/ruby-1.9.3-p194/bin/pod:22:in `<main>'

如何正确安装pod以及为什么我收到ruby 1.9.3的消息？