M-x grep-find 全局查找字符串
grep find things inside files 在文件中查找内容
FIND grep 在文件中查找字符串 ; 文件及文件内容的查找 ; 查找
where is find grep 从标准目录中找
ls find grep 查找
Grep can find fixed sequences of characters and can even ignore case with the -i option.
grep可以查找具有固定顺序的字符组合，甚至可以通过使用- i选项来忽略大小写。
For example, a simple grep command can help you find files that match certain search criteria.
例如，一个简单的grep命令能够帮助您找到匹配特定搜索条件的文件。
Through the paintbrush example, you learned how to navigate the source tree and use grep to find to find the code that implements the features you want to modify.
通过这个画笔示例，您了解到如何导航源代码树以及使用grep来查找实现您想修改的特性的代码。
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