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Linux里你必须掌握的Shell语法-小小小平凡
source link: http://blog.51cto.com/swiki/2073456
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For循环##通常For循环用来执行一些重复不变步骤 for i in `ls /tmp` ##为ls /tmp设置变量为i do ##所以执行do与Done内的操作，do对
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