Disable CTRL-ALT-DEL On A Linux Box

Pressing the CTRL-ALT-DEL combination of keys on a Linux box forces it to reboot

This is set up within /etc/inittab.

To change how this key combination behaves, edit this file.

Search for the line:
ca::ctrlaltdel:/sbin/shutdown -t3 -r now
and change it to:
ca::ctrlaltdel:/bin/echo "CTRL-ALT-DEL is disabled"
Save the file, then run:
init q
to reload the inittab and activate the change.