$ ls -l dir
-rw-rw-r-- 1 bigblues bigblues 0 Apr 20 14:29 file
-rw-rw-r-- 1 bigblues bigblues 0 Apr 20 14:40 file0
$ ln -s dir s
$ ln -sd dir sd
$ ls -l
total 4
drwxrwxr-x 2 bigblues bigblues 4096 Apr 20 14:40 dir
lrwxrwxrwx 1 bigblues bigblues 3 Apr 20 14:43 s -> dir
lrwxrwxrwx 1 bigblues bigblues 3 Apr 20 14:43 sd -> dir
[bigblues@localhost ~]$ ls s
file file0
[bigblues@localhost ~]$ ls sd
file file0