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See battery percentage in Terminal and GeekTool
Authored by: mael on Dec 15, '10 03:12:40AM

Unfortunately pmset spams my system.log with useless messages like
"executing /usr/bin/pmset"

The following command is quicker, more precise, does not make any entries in any log and works for me. It does look a little more complex, though:

ioreg -n AppleSmartBattery -r | awk '$1~/Capacity/{c[$1]=$3} END{OFMT="%.2f%%"; max=c["\"MaxCapacity\""]; print (max>0? 100*c["\"CurrentCapacity\""]/max: "?")}'

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