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命令行参数与 IO 重定向
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通过上述努力,我们可以支持文件重定向,当然这需要 usershell 做一些字符串解析的工作。但我们尴尬的发现,我们的 os 甚至还不支持带参数的 exec,也就是 ``main(int argc, char** argv)``,所以我们在 lab6 通过修改 exec 支持了这一点。