OSX10.11(10.10以后)更新cocoapods

gem sources --remove https://rubygems.org/ gem sources -a https://ruby.taobao.org/[/code] 

注意:是https,不是http
2.验证更新是否成功.
gem sources -l

*** CURRENT SOURCES ***
 https://ruby.taobao.org/[/code] 
3.更新ruby环境
sudo gem update --system


4.安装cocoa pod
sudo gem install cocoapods


笔者遇到错误.
ERROR:While executing gem ... (Errno::EPERM)
Operation not permitted - /usr/bin/pod


后经查论坛改用:
sudo gem install -n /usr/local/bin cocoapods


5.安装成功后,命令行下执行
pod search afn


仍然command not found.查实/usr/local/bin/下确实有pod文件.于是通过编辑~/.bash_profile,添加
export PATH=/usr/local/bin:$PATH


终于cocoapods正常使用.

20151024更新.
pod install --verbose --no-repo-update
pod update --verbose --no-repo-update