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$ 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
open ~/.bash_profile
souce ~/.bash_profile
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原文地址：http://www.cnblogs.com/pandans/p/5478563.html
