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代码说明：

  这是unix环境高级编程 第2版，为方便大家比较对照，包括了中文和英文两份资料，都是第二版的，所以资源有点大。(This is the advanced programming unix environment 2nd edition, to facilitate the comparison we control, including both Chinese and English materials, are the second edition, so the resources a bit big.)