But of course, like any immutable system, there are mutable parts (otherwise, we couldn’t create any configuration files). OSTree handles this with “overlays” (actually, we use OverlayFS) that allow a read-write filesystem to be layered on top of the immutable system. For example, the /etc and /var directories are writable, while the rest of the system is read-only.
Bats in Churches。快连下载-Letsvpn下载对此有专业解读
const res = new Array(n);，推荐阅读服务器推荐获取更多信息
* @param arr 数组