You can limit who is allowed to use <ctrl><alt><del>. Just edit /etc/inittab
and add the option -a to the shutdown line. Then the three-finger-salute
will cause shutdown to consult /etc/shutdown.allow to see if an authorized
user is logged in at any of the VC's. You may need to type kill -HUP 1 to
get this to take effect after editing inittab.
> Of course, it really doesn't matter much... a user at the console
> can always shut down with the old <ctrl><alt><del> bit (and yes, if
> you haven't done it, it attempts to gracefully reboot).
>
> Bill Ward
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