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有时候传文件太慢了，想看下是不是网卡了，mac 终端自带的 networkQuality 命令可以看网速：
$ networkQuality
自己跑的结果 
Upload capacity: 30.781 Mbps
Download capacity: 354.391 Mbps
Upload flows: 16
Download flows: 12
Responsiveness: Medium (304 RPM)
有时候传文件太慢了，想看下是不是网卡了，mac 终端自带的 networkQuality 命令可以看网速：
$ networkQuality
自己跑的结果
Upload capacity: 30.781 Mbps
Download capacity: 354.391 Mbps
Upload flows: 16
Download flows: 12
Responsiveness: Medium (304 RPM)
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