On RedHat any valid user can shut down or reboot the sysytem by giving the following shell command
user@machine # poweroff
user@machine # reboot
How can I disable it? I have already disabled CrlAltDel.
Also is there any other way a nonprivileged user can shutdown a system, if so how do I disable it.
Geek by Nature
GNU/Linux by choice
If GNU/Linux doesn't have the solution, you have the wrong problem
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Unix is very simple, Only it takes a genius to simplify it