CocoaPods 更新安装权限问题

今天学习持续集成安装fastlane的时候遇到了鸡儿权限的问题
和这篇文章的权限差很少CocoaPods安装出现SSL verification error
安装这篇文章修改了下，嗯？pod命令很差使了，而后我按照这篇文章从新安装了cocoapods，CocoaPods安装方法-2018.03.27
2017最新CocoaPods安装
遇到下面问题：

Kikyo-2:~ kikyo$ sudo gem install -n /usr/local/bin cocoapods
GemWrappers: Can not wrap missing file: pod
GemWrappers: Can not wrap missing file: sandbox-pod
Successfully installed cocoapods-1.5.2
Parsing documentation for cocoapods-1.5.2
Done installing documentation for cocoapods after 2 seconds
1 gem installed
Kikyo-2:~ kikyo$ pod setup
-bash: pod: command not found

sudo gem install -n /usr/local/bin cocoapods 报错
GemWrappers: Can not wrap missing file: pod
GemWrappers: Can not wrap missing file: sandbox-pod
而后pod命令没法识别

找了好多方法，gem卸载cocoapods+重装+下降Ruby版本都试了不行， 
而后看底下评论和我一个问题  
使用sudo gem install -n /usr/local/bin cocoapods 更新cocoapods 报错，用sudo gem install cocoapods 这个更新就行了，真奇怪！
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