Linux command2

. CentOS

想查看哪个port开了，却提示命令无效

# yum -y install net-tools

2. How to install "wget" command  in Linux and how to use multiple :             
   https://www.cyberciti.biz/tips/linux-wget-your-ultimate-command-line-downloader.html

3. 

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原文地址：https://www.cnblogs.com/ngtest/p/9801713.html