Subject: Is this soft link directory bug?

From: Taroe90 <[email-masked]>
Date: Mon, 18 Feb 2013 11:26:42 +0800

Hi,
sorry for my poor english

ping@ping-kubuntu:~/mywork/test/shell/ln/a$ ll
总用量 8
drwxrwxr-x 2 ping ping 4096 2月 18 11:23 ./
drwxrwxr-x 3 ping ping 4096 2月 18 11:22 ../
ping@ping-kubuntu:~/mywork/test/shell/ln/a$ ln -fs
/home/ping/mywork/test/shell/ln/a /home/ping/mywork/test/shell/ln/b
ping@ping-kubuntu:~/mywork/test/shell/ln/a$ ll
总用量 8
drwxrwxr-x 2 ping ping 4096 2月 18 11:23 ./
drwxrwxr-x 3 ping ping 4096 2月 18 11:22 ../
lrwxrwxrwx 1 ping ping 33 2月 18 11:23 a ->
/home/ping/mywork/test/shell/ln/a/
ping@ping-kubuntu:~/mywork/test/shell/ln/a$ cd ..
ping@ping-kubuntu:~/mywork/test/shell/ln$ ll
总用量 12
drwxrwxr-x 3 ping ping 4096 2月 18 11:22 ./
drwxr-xr-x 9 ping ping 4096 2月 18 10:57 ../
drwxrwxr-x 2 ping ping 4096 2月 18 11:23 a/
lrwxrwxrwx 1 ping ping 33 2月 18 11:22 b ->
/home/ping/mywork/test/shell/ln/a/
ping@ping-kubuntu:~/mywork/test/shell/ln$

Why in a directory will appear a soft link?
using absolute path.