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Better to use this command instead of installing whole new application to check the battery stats.
adjusting the field "f1" will give you additional information such as
f1 = 98%
f2 = discharging
f3 = 2:02 remaining
Works on Laptops, Desktop having communication b/w UPS & CPU
If you want to do the same in OS X... grep as necessary for information you need....
Probably the most info for the least work.
With progress bar.. hahaa this is friggin' kludge
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.
The original proc file doesn't exist on my system.
Run this command as root to get enough stats. It works on AMD and Intel machines, including desktops. If ran on a laptop it'll give you suggestions on extending your battery life.
You'll need to install PowerTOP if you don't have, via 'apt-get install powertop', etc.
To grep the output use: sudo powertop -d | grep ...
The many command suggestions PowerTOP gives you alone will increase your command-line fu!