networksetup -setsocksfirewallproxy "Wi-Fi" localhost 8080
To clear the domain and port
networksetup -setsocksfirewallproxy """"""
To turn the SOCKS proxy off
networksetup -setsocksfirewallproxystate "Wi-Fi" offfrom https://gist.github.com/jordelver/3073101
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实际上，就是设置safari浏览器的代理。