什么是双点（..）和单点（。）在Linux？ [英] What is double dot(..) and single dot(.) in Linux?

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：硬链接和Unix文件系统节点（inode）

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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