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Discussion on: Linux Battery Percentage Correction

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nealmcb profile image
Neal McBurnett

Note that the "let" command in bash lets you avoid the need for bc. And here's how to make a function out of the code, so it is a bit more efficient, and is easy to run on even a chromebook. :)

function battery_level {                                                                                                                            
 charge_current="$(cat /sys/class/power_supply/BAT0/charge_now)"                                                                                    
 charge_full="$(cat /sys/class/power_supply/BAT0/charge_full)"                                                                                      
 let "current=100*$charge_current/$charge_full"                                                                                                     
 echo "$current%"                                                                                                                                   
}                                                                                                                                                   
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samerickson profile image
Sam Erickson Author

Thanks for the tip. I had no idea you could do arithmetic using let.