Nachos上开发的一个初级shell。Shell支持cd, dir, clr, environ, echo, help, pause and quit命令；上述命令之外的其他命令通过系统调用fork和exec创建子进程实现； -Nachos on the development of a primary shell. Shell support cd, dir, clr, environ, echo, help, pause and quit order the order other

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