System control

Lock screen
$ gnome-screensaver-command -l
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$ dbus-send --type=method_call --dest=org.freedesktop.ScreenSaver /ScreenSaver org.freedesktop.ScreenSaver.Lock
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Unlock screen
$ gnome-screensaver-command -a
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$ dbus-send --type=method_call --dest=org.freedesktop.ScreenSaver /ScreenSaver org.freedesktop.ScreenSaver.SetActive boolean:false
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Reboot the system
$ reboot
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$ shutdown -r
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Shutdown the system
$ poweroff
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$ shutdown -h now
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$ reboot -p
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Shutdown the system at specific time
$ shutdown -h 18:45 "Server is going down for maintenance"
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Stop bluetooth service
$ service bluetooth stop
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Start bluetooth service
$ service bluetooth start
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Stop wifi service
$ nmcli nm wifi off
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Start wifi service
$ nmcli nm wifi on
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Turn off monitor
$ xset dpms force off
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