APP 
linux 命令英文全称目录/bin = BINaries/dev = DEVices /etc = ETCetera/lib = LIBrary/proc = PROCesses /sbin = Superuser BINaries /tmp = TeMPorary /usr = Unix Shared Resources/var = VARiable 术语FIFO = First In, First Out GRUB = GRand Unified BootloaderIFS ......
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