＃＃＃管道符
＊命令格：
命令1 | 命令2 //命令１的正确输出作为命令２的操作对象
ll | more
netstat -an | grep xxx
通配符
类似于正则表达式
*
? 一个以上
[] 一个
[^] 逻辑非
linux 管道符与通配符
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