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#!/usr/bin/env bash
batteries=(/sys/class/power_supply/BAT*)
# Check if any battery directories exist
found=false
for b in "${batteries[@]}"; do
if [ -d "$b" ]; then
found=true
break
fi
done
if [ "$found" = false ]; then
echo "None"
exit 1
fi
first=true
for battery in /sys/class/power_supply/BAT*; do
if [ -d "$battery" ]; then
if [ -r "$battery/capacity" ]; then
capacity=$(<"$battery/capacity")
else
capacity=0
fi
if [ "$first" = true ]; then
echo -n "${capacity}%"
first=false
else
echo -n " ${capacity}%"
fi
fi
done
echo
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