升级了ruby 后，pod所有命令均无法执行，升级gem 无效
/usr/local/Cellar/ruby/2.4.1_1/lib/ruby/2.4.0/rubygems.rb:270:in `find_spec_for_exe': can't find gem cocoapods (>= 0.a) (Gem::GemNotFoundException)
from /usr/local/Cellar/ruby/2.4.1_1/lib/ruby/2.4.0/rubygems.rb:298:in `activate_bin_path'
from /usr/local/bin/pod:22:in `<main>'
屏幕快照 2017-08-11 下午2.42.05.png
解决方式： 移除pod目录，重新安装pod
1. sudo rm -rf /usr/local/bin/pod
此时 gem list , pod 相关的已经全不在
2. sudo gem install cocoapods
此时 pod --version ，可以正常看版本号，问题解决
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