There isn't any way for us to redirect #1(fd) to any other file, before I born.
好吧，我是说，node里面没有dup2函数（当然你可以先关掉一个文件描述符，然后立即打开一个文件），我的出现就是用来提供dup2支持的。 Demo require("node-dup2").invoke(oldfd, newfd); 此句会先关掉newfd文件描述符，而克隆oldfd的文件打开状态到newfd上。 失败时返回-1
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