pod 报错 Operation not permitted - /usr/bin/pod

pod 安装遇到的坑

换了台电脑，结果pod 各种报错，总结下遇到错误的解决版本，
安装的时候 在Mac OS X EL Capitan(10.11)中就会出现Operation not permitted - /usr/bin/pod的错误，网上找别人的方法

$ mkdir -p $HOME/Software/ruby$ export GEM_HOME=$HOME/Software/ruby$ gem install cocoapods[...]1 gem installed cocoapods  $ export PATH=$PATH:$HOME/Sofware/ruby/bin

下载是成功了，但是后面我操作pod 命令时候很慢，是在下载一些Cocoapods的一些信息在~/.cocoapods这个目录。可以用 *命令查看。最终的大小应该是100+M左右的状态。
等到成功就好了，
然后用pod version 可以看到安装成功了，

但是当我关掉命令行，再次打开的时候，操作命令，直接报错

Library/Ruby/Site/2.0.0/rubygems/dependency.rb:318:in `to_specs': Could not find 'cocoapods' (>= 0) among 33 total gem(s) (Gem::LoadError)Checked in 'GEM_PATH=/Users/xianlong/.gem/ruby/2.0.0:/Library/Ruby/Gems/2.0.0:/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/gems/2.0.0', execute `gem env` for more informationfrom /Library/Ruby/Site/2.0.0/rubygems/dependency.rb:327:in `to_spec'from /Library/Ruby/Site/2.0.0/rubygems/core_ext/kernel_gem.rb:64:in `gem'from /usr/local/bin/pod:22:in `<main>'

好蛋疼。。。。然后继续查找原因，网上说先卸载，然后重新安装，操作步骤搬过来 如下：

卸载Pod:step1:which pod: 查看pod命令所在路径,比如为/usr/local/bin/pod，然后执行 rm -rf /usr/local/bin/pod 将pod命令移除step2:执行gem list | grep cocoapods  查看所有与cocoapods相关的已安装的组件，然后挨个卸载我这里的执行结果是：cocoapods-core (0.39.0)cocoapods-downloader (0.9.3)cocoapods-plugins (0.4.2)cocoapods-search (0.1.0)cocoapods-stats (0.6.2)cocoapods-trunk (0.6.4)cocoapods-try (0.5.1)然后我就挨个执行：gem uninstall cocoapods-coregem uninstall cocoapods-downloadergem uninstall cocoapods-pluginsgem uninstall cocoapods-searchgem uninstall cocoapods-statsgem uninstall cocoapods-trunkgem uninstall cocoapods-trystep3: 重新安装pod执行sudo gem install cocoapods， 提示出错：While executing gem ... (Errno::EPERM)     Operation not permitted - /usr/bin/pod在命令中指定安装到/usr/bin/pods下即可正常安装成功：sudo gem install -n /usr/local/bin  cocoapods 安装成功，

这样就成功了，所以说遇到这种问题，要淡定，一点一点来，总会解决的，

参考文章
http://www.pluto-y.com/cocoapods-getting-stared/
http://www.cnblogs.com/hanxianlong/p/4984318.html