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adjusting the field "f1" will give you additional information such as
f1 = 98%
f2 = discharging
f3 = 2:02 remaining
If you want to do the same in OS X... grep as necessary for information you need....
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!
Displays all information about your battery. for just capacity, try replacing cat with
grep -F capacity:
Battery number might be BAT0 instead of BAT1. Just run
cd /proc/acpi/battery; ls
and find out what folder is in that directory and replace that name with BAT1