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

问题描述

ls -ai 命令显示 . 和 .. 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 the same as the current directory and parent directory, respectively.

. 和 .. 究竟是什么?

它们是真实的文件还是硬链接?但据我所知，不允许创建指向目录的硬链接.

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

它们是特殊的 name-inode 映射，尽管它们不是真正的硬链接，但它们确实算作硬链接(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.在此处阅读更多信息: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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