Hitting CTRL-ALT-DELETE on most Linux distributions will start the soft reboot process. Normally I like to disable
this (at least on production systems) because someone might make a
mistake and reboot the system. Also what I don’t like about this
shortcut is that you don’t need to be logged in (no user/password needed – but only console access) to reboot the system.
01. Login as root
02. Edit the following system file (inittab)
03. To locate the system file
04. To find out the file type
06. Comment this line (insert # mark)
07. Save this file
08. Exit the file
09. Reload the inittab file in to memory again
01. Login as root
02. Edit the following system file (inittab)
03. To locate the system file
[root@daddylinux~]#whereis inittab
04. To find out the file type
[root@daddylinux~]#file /etc/inittab
05. To edit the text editor
[root@daddylinux~]#nano /etc/inittab
06. Comment this line (insert # mark)
#ca::ctrlaltdel:/sbin/shutdown –ts –r now
07. Save this file
Ctrl + O
08. Exit the file
Ctrl + X
09. Reload the inittab file in to memory again
[root@daddylinux~]#init q
or otherwise we have to restart the system 
This is out of date. CentOS 6.3 for example uses the /etc/control-alt-delete.conf file to control CTRL-ALT-DEL key sequence response.
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