The 386's protection architecture is a study in engineering tradeoffs on a tight transistor budget. The designers put dedicated hardware where it paid off most:
export "$var=$value"
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// 复制剩余元素（只需复制左数组剩余，右数组已在原位置）
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.
，更多细节参见夫子
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// First, we acquire a reader that gives an exclusive lock