Boot linux in the single mode

Boot linux in the single mode

http://www.cyberciti.biz/faq/grub-boot-into-single-user-mode/
(2) Select the kernel
(3) Press the e key to edit the entry
(4) Select second line (the line starting with the word kernel)
(5) Press the e key to edit kernel entry so that you can append single user mode
(6) Append the letter S (or word Single) to the end of the (kernel) line
(7) Press ENTER key
(8) Now press the b key to boot the Linux kernel into single user mode
(9) When prompted give root password and you be allowed to login into single user mode.

http://www.cyberciti.biz/tips/howto-recovering-grub-boot-loader-password.html

In Centos 5.4, this method seems not work. 20100305 testing