// Print out the udev special fields
still around, although declining in use, in the 1970s. The 3612 had a slot on，详情可参考服务器推荐
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The A/D bits exist entirely for the operating system's benefit. The Accessed bit tells the OS which pages have been recently used, enabling page replacement algorithms to choose pages to evict when memory runs low. The Dirty bit tells the OS which pages have been modified and must be written back to disk before eviction; clean pages can simply be discarded and re-read from disk later.
&& chmod 700 /home/${USERNAME}