问题描述
ls -ai 命令显示。和 .. 它们的inode分别与当前目录和父目录相同。
The ls -ai command shows that . and .. have their inodes same as current directory and parent directory, respectively.
任何人都可以告诉我究竟什么是。和 .. 是？
Could anyone tell me what exactly . and .. are?
他们是真实的文件甚至硬链接？但是如我所知，不允许创建一个到目录的硬链接。
Are they real files or even hard links? But as I have known, it's not allowed to create a hard link to a directory.
推荐答案
他们是特殊的名称尽管它们不是真正的硬链接，但它确实算作硬链接（它们确实增加了链接数），因为正如你所说，目录不能有硬链接。在这里阅读更多：
They are special name-inode maps which do count as hard-links (they do increase the link-count) though they aren't really hard-links, since, as you said, directories can't have hard-links. Read more here: Hard links and Unix file system nodes (inodes)
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