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http://stackoverflow.com/questions/32891965/error-while-executing-gem-errnoeperm-operation-not-permitted
$ sudo gem install cocoapods
ERROR: While executing gem ... (Errno::EPERM)
Operation not permitted - /usr/bin/sass
yulongdeMacBook-Air:~ yulong$
改为
sudo gem install -n /usr/local/bin cocoapods
安装在这个路径下
/Users/yulong/.cocoapods/repos/master
如果出现pod search 库名找不到，但是库又是有的
解决的方式： 先移除掉/Users/yulong/.cocoapods/repos/master
再重新安装CocoaPods ， 安装命令
gem sources --remove https://rubygems.org/
gem sources -a https://ruby.taobao.org/
sudo gem install -n /usr/local/bin cocoapods
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