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。

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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。

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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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