在mac osx上安装RVM和ZSH后出现如下警告：

Warning! PATH is not properly set up, $GEM_HOME is not set,
usually this is caused by shell initialization files - check them for 'PATH=...' entries,
it might also help to re-add RVM to your dotfiles: 'rvm get stable --auto-dotfiles'

打开 ~/.zshrc文件，找到PATH设置

export PATH="/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/Users/bruce.wu/.rvm/bin"

在最前面加上$PATH就好了，修改之后如下

export PATH="$PATH:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/Users/bruce.wu/.rvm/bin"