为什么不看看tail命令的源码呢? [https://github.com/coreutils/coreutils/blob/master/src/tail.c](https://link.segmentfault.com/?enc=KZS7FVvkU%2B4DaRVn7Z7YEw%3D%3D.2pHhXOQmQhFkYga4xrwe0Km0Fo2uD2sbQh8Za6qwavSreyYqtEgfeHDN%2BRah6dXp9zQIb3234p0CJ9OIm8MsuA%3D%3D)
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