minimize use of root account

[Ardie H. Hwang]

On Fri, Feb 19, 2016, at 14:29, Yudi V wrote:
> also when I have to shutdown/reboot, I need to run the command as root but
> instead would like for the normal user to be able to shutdown and reboot.

Adding a normal user to `operator` group allows the user to use `shutdown(1) command. `reboot(1)` is only for root, but it can be substituted with `shutdown -r now`.

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Ardie H. Hwang
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