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No need to be root to do that. Relies on UPower (previously known as DeviceKit-Power).
There are 3 alternatives - vote for the best!
It suspends to RAM: you always need your batteries for the RAM but it saves time as there is no need to slowly archive everything on your hard disk.
It works fine with me but if anyone has a nicer way, please contribute.
If you can do better, submit your command here.
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