macos安装cocoapods

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查看ruby的版本
ruby -v

查看gem的版本
gem -v

查看gem的源
gem sources -l

通过gem下载cocoapods
sudo gem install cocoapods
我尝试过不加sudo报错如下：

ERROR:  While executing gem ... (Gem::FilePermissionError)
    You don't have write permissions for the /Library/Ruby/Gems/2.6.0 directory.

网上说下载完成后还要执行pod setup。我执行了一下，瞬间完成。