# ls /usr/src
total 28
-rw-r--r--  1 root root    0 Nov 13  2005 .keep
lrwxrwxrwx  1 root root   15 Jun 14 16:39 linux -> linux-2.6.16.20
drwxr-xr-x 20 root root 4096 Feb 12 19:35 linux-2.6.15.1
drwxr-xr-x 20 root root 4096 Apr  8 08:51 linux-2.6.16
drwxr-xr-x 20 root root 4096 Jun 14 16:41 linux-2.6.16.20
drwxr-xr-x 20 root root 4096 Jun 10 12:14 linux-2.6.17-rc1
drwxr-xr-x 19 root root 4096 May 24 18:20 linux-2.6.17-rc4
drwxr-xr-x 19 root root 4096 May 30 23:03 linux-2.6.17-rc5
drwxr-xr-x 20 root root 4096 Jun 14 15:09 linux-2.6.17-rc6