yuan@localhost:~$ ls -al /etc/apt/sources.list.d
total 20
drwxr-xr-x 2 root root 4096 May 14 03:11 .
drwxr-xr-x 6 root root 4096 May 14 03:11 ..
-rw-r--r-- 1 root root   82 May 14 03:11 precise-partner.list
-rw-r--r-- 1 root root   82 May 14 03:11 precise-partner.list.save
-rw-r--r-- 1 root root  136 May 14 03:11 webupd8team-java-precise.list
yuan@localhost:~$