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/etc is also writable, but it’s managed a bit differently. OSTree uses a technique called “etc overlay” to handle modifications in /etc. When an update is applied, OSTree compares files in the new version with those in /etc and applies changes intelligently, preserving local modifications as much as possible.,更多细节参见91视频
arr[k++] = arr[mid + (j++)];。51吃瓜对此有专业解读