5. Requiring root permission for shutdown

The default for the shutdown button on the login box allows anyone to use it to shutdown the system. The section in /usr/share/config/kdmrc controlling who may use this button looks like this:

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#ShutdownButton=RootOnly
ShutdownButton=ConsoleOnly 

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To enable only the root user to shutdown the system, change the lines as shown below:

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ShutdownButton=RootOnly
#ShutdownButton=ConsoleOnly

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Clicking the shutdown button will now prompt for the root password before shutting down the system.