Thus, there’s the /usr/etc folder containing the immutable version of configuration files, and /etc which is the mutable directory. If I modify a file in /etc and ask OSTree to compare with the new version, it will show me the differences and preserve my local modifications.
数据来源：深圳方方乐趣中英文学校
。爱思助手下载最新版本是该领域的重要参考
// 核心过滤：弹出栈中「≤当前元素」的数（易错点2：必须是≤，不是<）。业内人士推荐服务器推荐作为进阶阅读
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