. ..是什么阿

[longgyifei]

我在／目录下ls -a一下，发现里面有.和..，我知道在linux里面cd. 和cd..的意思，但是单独的.和..是什么阿，难道也是文件吗，如果是隐藏文件的话，后面也应该跟文件名的阿，有谁能告诉我/目录下的.和..是什么么？

[longgyifei]

我刚才在每个文件夹里都ls －a了一下，发现每个目录下都有.和..，是不是这个的作用就是用来返回上一级目录用的啊，这个能修改么

[JangMunho]

. 当前目录
.. 父目录
不要大惊小怪，Windows下用dir命令也能看到.和..。

[longgyifei]

JangMunho
这是不是就相当于一个链接阿，我能不能手动修改把.改成父目录，把..改成当前目录阿，

[JangMunho]

代码： 全选

mingo@mingo-desktop:~$ file .
.: directory
mingo@mingo-desktop:~$ ls -l
总用量 129
drwxr-xr-x  2 mingo mingo     48 2008-02-03 14:42 bin
drwxr-xr-x  2 mingo mingo   1032 2008-02-10 20:25 Desktop
drwxr-xr-x 15 mingo mingo   1120 2008-02-03 16:37 Download
lrwxrwxrwx  1 mingo mingo     26 2008-02-03 14:26 Examples -> /usr/share/example-content
drwxr-xr-x  2 mingo mingo    208 2008-02-03 18:31 getdebs
drwx------  2 mingo mingo    280 2008-02-08 20:54 MyDownloads
-rw-r--r--  1 mingo mingo 126976 2008-02-10 20:42 nautilus-debug-log.txt
drwxr-xr-x  3 mingo mingo     72 2008-02-03 17:08 usr
drwxr-xr-x  5 mingo mingo    168 2008-02-10 20:34 vmware
drwxr-xr-x  3 mingo mingo     80 2008-02-05 21:54 workspace
drwxr-xr-x  4 mingo mingo    104 2008-02-10 17:49 公共的
drwxr-xr-x  2 mingo mingo     48 2008-02-03 14:31 模板
drwxr-xr-x  7 mingo mingo    280 2008-02-08 12:00 视频
drwxr-xr-x  3 mingo mingo    568 2008-02-10 18:23 图片
drwxr-xr-x  5 mingo mingo    408 2008-02-03 18:41 文档
drwxr-xr-x 55 mingo mingo   2552 2008-02-10 16:04 音乐
drwxr-xr-x  2 mingo mingo     48 2008-02-03 18:59 桌面
mingo@mingo-desktop:~$ ln -s nautilus-debug-log.txt link
mingo@mingo-desktop:~$ file link
link: symbolic link to `nautilus-debug-log.txt'
mingo@mingo-desktop:~$ ln nautilus-debug-log.txt hardlink
mingo@mingo-desktop:~$ file hardlink 
hardlink: ASCII English text
mingo@mingo-desktop:~$ mkdir testdirectory
mingo@mingo-desktop:~$ cd testdirectory/
mingo@mingo-desktop:~/testdirectory$ rm .
rm: 无法删除‘.’或‘..’
mingo@mingo-desktop:~/testdirectory$ ln . current
ln: ‘.’: 不允许将硬链接连至目录
mingo@mingo-desktop:~/testdirectory$ ln -s . current
mingo@mingo-desktop:~/testdirectory$ file current
current: symbolic link to `.'
mingo@mingo-desktop:~/testdirectory$ rm current
mingo@mingo-desktop:~/testdirectory$ cd ..
mingo@mingo-desktop:~$ rm link 
mingo@mingo-desktop:~$ rm hardlink 
mingo@mingo-desktop:~$ ls -l
总用量 129
drwxr-xr-x  2 mingo mingo     48 2008-02-03 14:42 bin
drwxr-xr-x  2 mingo mingo   1032 2008-02-10 20:25 Desktop
drwxr-xr-x 15 mingo mingo   1120 2008-02-03 16:37 Download
lrwxrwxrwx  1 mingo mingo     26 2008-02-03 14:26 Examples -> /usr/share/example-content
drwxr-xr-x  2 mingo mingo    208 2008-02-03 18:31 getdebs
drwx------  2 mingo mingo    280 2008-02-08 20:54 MyDownloads
-rw-r--r--  1 mingo mingo 126976 2008-02-10 20:42 nautilus-debug-log.txt
drwxr-xr-x  2 mingo mingo     48 2008-02-11 14:07 testdirectory
drwxr-xr-x  3 mingo mingo     72 2008-02-03 17:08 usr
drwxr-xr-x  5 mingo mingo    168 2008-02-10 20:34 vmware
drwxr-xr-x  3 mingo mingo     80 2008-02-05 21:54 workspace
drwxr-xr-x  4 mingo mingo    104 2008-02-10 17:49 公共的
drwxr-xr-x  2 mingo mingo     48 2008-02-03 14:31 模板
drwxr-xr-x  7 mingo mingo    280 2008-02-08 12:00 视频
drwxr-xr-x  3 mingo mingo    568 2008-02-10 18:23 图片
drwxr-xr-x  5 mingo mingo    408 2008-02-03 18:41 文档
drwxr-xr-x 55 mingo mingo   2552 2008-02-10 16:04 音乐
drwxr-xr-x  2 mingo mingo     48 2008-02-03 18:59 桌面
mingo@mingo-desktop:~$ 

你明白了吧。

[chattan]

. 当前目录
.. 父目录
不要大惊小怪，Windows下用dir命令也能看到.和..。

记住这个就行了！