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五周第四次课（3月8日）-lyx79
source link: http://blog.51cto.com/461565/2084467
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五周第四次课（3月8日）8.6管道符和作业控制8.7/8.8shell变量8.9环境变量配置文件扩展bashrc和bash_profile的区别http://ask.apelearn.com/question/7719简易审计系统：http://www.68idc.cn/help/server/linux/2014042190951.html关于PROMPT_COMMAND环境变量的含义http:
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