rbenv 工作但 ruby 版本没有改变

rbenv working but ruby version not changing 

❯ rbenv version
system (set by /Users/eric.nguyen/.rbenv/version)
                                                                                                                                                             
❯ rbenv local 2.4.2
                                                                                                                                                           

❯ gem install bundler
ERROR:  While executing gem ... (Gem::FilePermissionError)
    You don't have write permissions for the /Library/Ruby/Gems/2.0.0 directory.
                                                                                                                                                           
❯ rbenv global 2.4.2
                                                                                                                                                           
❯ ruby -v
ruby 2.0.0p648 (2015-12-16 revision 53162) [universal.x86_64-darwin16]
                                                                                                                                                           
❯ rbenv version
2.4.2 (set by /Users/eric.nguyen/.ruby-version)
                                                                                                                                                           
❯ gem install bundler
ERROR:  While executing gem ... (Gem::FilePermissionError)
    You don't have write permissions for the /Library/Ruby/Gems/2.0.0 directory.
                                                                                                                                                           
❯ gem -v
2.0.14.1

Ruby 版本仍然是 2.0.0p648

我使用的是 macOS Sierra 10.12.6。
我已经完成了提到的所有事情 here

我已经完成了：

  1. rbenv rehash
  2. 将 eval "$(rbenv init -)" 放入我的 .zshrc 和 source ~/.zshrc
  3. 将$HOME/.rbenv/shims放入$PATH (/Users/eric.nguyen/.rbenv/shims:/usr/local/bin:/usr/bin:/bin:/usr/sbin :/sbin:/Users/eric.nguyen/Library/Android/sdk/tools:/Users/eric.nguyen/Library/Android/sdk/platform-tools:/Users/eric.nguyen/.rbenv/shims)

但它仍然没有改变 ruby 版本。

在使用 rbenv 安装新的 ruby 版本后以及安装具有命令行选项的 gem 后，您总是需要 运行 rbenv rehash

重启我的电脑解决问题。 

❯ ruby -v
ruby 2.4.2p198 (2017-09-14 revision 59899) [x86_64-darwin16]


❯ gem -v
2.6.13