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Install RVM

whck6

原本想說用 brew 安裝 ruby 結果沒想到版本相依的問題，這麼難搞，用了好幾天，實在沒辦法！最後還是用決定 RVM 了。

\curl -sSL https://get.rvm.io | bash -s stable
rvm install x.x.x (e.g. 2.5.1)
rvm list
=> ruby-2.3.7 [ x86_64 ]
   ruby-2.4.4 [ x86_64 ]
 * ruby-2.5.1 [ x86_64 ]

# => - current
# =* - current && default
#  * - default

rvm use x.x.x
Using $HOME/.rvm/gems/ruby-x.x.x

RubyGems Environment

gem env
RubyGems Environment:
  - RUBYGEMS VERSION: 2.7.7
  - RUBY VERSION: 2.3.7 (2018-03-28 patchlevel 456) [x86_64-darwin17]
  - INSTALLATION DIRECTORY: $HOME/.rvm/gems/ruby-2.3.7