原来在文件中查找这么简单，就一个 -r 呵呵。
grep的其他有用的参数： -i 忽略大小写 -w 整字匹配 -x 整行匹配 -b 显示在第几个字节找到 -n 显示在第几行找到 -c 只显示每个文件的匹配行数
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