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Probably the most info for the least work.
There are 2 alternatives - vote for the best!
The original proc file doesn't exist on my system.
In my case it was actually like this...
This prints "Charging" or "Discharging". Obviously, this will indicate the status of the AC adapter. The awk part could be from 1-6. I removed the comma because it is useless when only looking at one element of the output array. See acpi(1) for more info.
If you can do better, submit your command here.
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