Ruby新手，我在加载路径方面遇到了问题

我最近通过源代码编译在OSX10.8.3上安装了Ruby2.0.0。我用计算机检查了版本

$ ruby --version
ruby 2.0.0p195 (2013-05-14 revision 40734) [x86_64-darwin12.3.0]

$ gem env
RubyGems Environment:
  - RUBYGEMS VERSION: 2.0.3
  - RUBY VERSION: 1.8.7 (2012-02-08 patchlevel 358) [universal-darwin12.0]
  - INSTALLATION DIRECTORY: /Library/Ruby/Gems/1.8
  - RUBY EXECUTABLE: /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby
  - EXECUTABLE DIRECTORY: /usr/bin
  - RUBYGEMS PLATFORMS:
    - ruby
    - universal-darwin-12
  - GEM PATHS:
     - /Library/Ruby/Gems/1.8
     - /Users/ehartsuyker/.gem/ruby/1.8
     - /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/gems/1.8
  - GEM CONFIGURATION:
     - :update_sources => true
     - :verbose => true
     - :backtrace => false
     - :bulk_threshold => 1000
     - :benchmark => false
     - :sources => ["http://rubygems.org/", "http://gemcutter.org"]
  - REMOTE SOURCES:
     - http://rubygems.org/
     - http://gemcutter.org

我用我的电脑检查了我的gem版本

$ ruby --version
ruby 2.0.0p195 (2013-05-14 revision 40734) [x86_64-darwin12.3.0]

$ gem env
RubyGems Environment:
  - RUBYGEMS VERSION: 2.0.3
  - RUBY VERSION: 1.8.7 (2012-02-08 patchlevel 358) [universal-darwin12.0]
  - INSTALLATION DIRECTORY: /Library/Ruby/Gems/1.8
  - RUBY EXECUTABLE: /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby
  - EXECUTABLE DIRECTORY: /usr/bin
  - RUBYGEMS PLATFORMS:
    - ruby
    - universal-darwin-12
  - GEM PATHS:
     - /Library/Ruby/Gems/1.8
     - /Users/ehartsuyker/.gem/ruby/1.8
     - /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/gems/1.8
  - GEM CONFIGURATION:
     - :update_sources => true
     - :verbose => true
     - :backtrace => false
     - :bulk_threshold => 1000
     - :benchmark => false
     - :sources => ["http://rubygems.org/", "http://gemcutter.org"]
  - REMOTE SOURCES:
     - http://rubygems.org/
     - http://gemcutter.org

我注意到这里报告的Ruby版本与我安装的版本不匹配。我不知道这是否重要

我正在运行一段名为encrypy.rb的简单代码。使用gem安装“rsa”gem后，请安装rsa

require 'rubygems'
require 'rsa'

key = RSA::KeyPair.generate(128)
ciphertext = key.encrypt("message")
puts(ciphertext)

当我运行它时，它会给出一个错误，说它找不到宝石

$ ruby encrypt.rb -Idirectory '/Library/Ruby/Gems/1.8'
/usr/local/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:45:in `require': cannot load such file -- rsa (LoadError)
    from /usr/local/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:45:in `require'
    from encrypt.rb:2:in `<main>'

$ruby encrypt.rb-Idirectory'/Library/ruby/Gems/1.8'
/usr/local/lib/ruby/2.0.0/rubygems/core\u ext/kernel\u require.rb:45:在'require'中：无法加载这样的文件--rsa（LoadError）
from/usr/local/lib/ruby/2.0.0/rubygems/core\u ext/kernel\u require.rb:45:in'require'
来自encrypt.rb:2:in`'

---

所以问题是，尽管Ruby似乎知道宝石在哪里，但为什么它找不到呢？如何修复它呢？

Ruby 1.8.7随OS X一起提供。看来

gem

看到的是该版本，而不是手动安装的2.0.0。正如其他人已经建议的那样，使用RVM或rbenv（取决于个人喜好）使处理不同的ruby环境变得更加容易。您可以在以下位置找到这些工具及其说明：

RVM：

---

rbenv:

try Ruby的加载路径与GEM路径不同，如您所见。安装了两个Ruby Env。您可以手动设置GEM_路径和GEM_HOME，或者使用rvm/rbenv@ArieShaw rbenv更棒：）是的。RVM解决了所有问题。谢谢