croc 在两台电脑间传输文件
go 实现，方便 https://github.com/schollz/croc
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Sending 9.8 MB file named 'croc'
100% |████████████████████████████████████████| [20s:0s]
Received file written to croc2 (470 kB/s)
协议传输较慢（在同一台机器上mac -> virtualbox ubuntu 测试）