# ll /etc/pam.d/
total 152
drwxr-xr-x   2 root root  4096 Aug 18 18:04 ./
drwxr-xr-x 199 root root 12288 Oct 29 12:15 ../
-rw-r--r--   1 root root   179 Dec 13  2013 accountsservice
-rw-rw-r--   1 root root   220 Oct 21  2013 atd
-rw-r--r--   1 root root    81 Jun  8  2012 caldav
-rw-r--r--   1 root root   384 Jul 26  2013 chfn
-rw-r--r--   1 root root    92 Jul 26  2013 chpasswd
-rw-r--r--   1 root root   581 Jul 26  2013 chsh
-rw-r--r--   1 root root  1281 Aug  3 17:49 common-account
-rw-r--r--   1 root root  1208 Aug 22  2014 common-account.pam-old
-rw-r--r--   1 root root  1393 Aug  3 17:49 common-auth
-rw-r--r--   1 root root  1286 Aug 22  2014 common-auth.pam-old
-rw-r--r--   1 root root  1666 Aug  3 17:49 common-password
-rw-r--r--   1 root root  1588 Aug 22  2014 common-password.pam-old
-rw-r--r--   1 root root  1590 Aug  3 17:49 common-session
-rw-r--r--   1 root root  1510 Aug  3 17:49 common-session-noninteractive
-rw-r--r--   1 root root  1475 Aug 22  2014 common-session-noninteractive.pam-old
-rw-r--r--   1 root root  1555 Aug 22  2014 common-session.pam-old
-rw-r--r--   1 root root   527 Feb  9  2013 cron
-rw-r--r--   1 root root    69 Jul 16  2013 cups-daemon
-rw-r--r--   1 root root   752 Apr 10  2014 lightdm
-rw-r--r--   1 root root   510 Aug 21  2013 lightdm-autologin
-rw-r--r--   1 root root   636 Apr 10  2014 lightdm-greeter
-rw-r--r--   1 root root  4788 Jul 26  2013 login
-rw-r--r--   1 root root    92 Jul 26  2013 newusers
-rw-r--r--   1 root root   520 Oct 21  2013 other
-rw-r--r--   1 root root    92 Jul 26  2013 passwd
-rw-r--r--   1 root root   255 Nov  3  2013 polkit-1
-rw-r--r--   1 root root   168 Jan 22  2013 ppp
-rw-r--r--   1 root root    84 Dec  9  2013 samba
-rw-r--r--   1 root root  1199 Jan  4  2014 schroot
-rw-r--r--   1 root root  2139 Apr 14  2014 sshd
-rw-r--r--   1 root root  2305 Jul 26  2013 su
-rw-r--r--   1 root root   239 Dec 15  2013 sudo
-rw-r--r--   1 root root   319 May 16  2013 vsftpd