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一般来说一个程序的输出可分为标准输出和标准错误输出，这个已经众人皆知。但打印到屏幕上的输出一定是标准输出吗？答案是否定的！默认打印到屏幕上的输出不一定是标准输出。举一个最常用的例子。我想通过nginx -v或ngxin -V查看nginx的版本信息，如果我只想要最后面的...

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