ifup和ifdown:
ifup：用来打开指定的网络接口。
ifdown：用来关闭指定的网络接口。
例如：
sudo ifup eth0
sudo ifdown eth0
https://blog.csdn.net/seu_lyr/article/details/8713179
https://blog.csdn.net/lu_embedded/article/details/53215324
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