Linux是操作系统的内核
目录树
ls -l
-rwxr-xr-x 的是可执行文件
etc目录：配置文件，不要随便弄
Lib/lib64:系统的库
media:接入硬盘，就在这里面找
boot：引导文件，内核在里面
opt：
root:
sbin:
shutdown now -h 关机
Mac的内核是Unix
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