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```shell
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netstat -n | awk '/^tcp/ {++S[$NF]} END {for(a in S) print a, S[a]}'
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```
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**ESTABLISHED:指TCP连接已建立，双方可以进行方向数据传递**
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**CLOSE_WAIT:这种状态的含义其实是表示在等待关闭
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**TIME_WAIT:指连接已准备关闭**
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