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#!/bin/sh
BAT_FILE=/sys/class/power_supply/BAT0
for battery in $BAT_FILE; do
# If non-first battery, print a space separator.
[ -n "${capacity+x}" ] && printf " "
# Sets up the status and capacity
case "$(cat "$battery/status" 2>&1)" in
"Full") status="🔋" ;;
"Discharging") status="🔋-" ;;
"Charging") status="🔋+" ;;
"Not charging") status="🛑" ;;
*) exit 1 ;;
esac
capacity="$(cat "$battery/capacity" 2>&1)"
# Will make a warn variable if discharging and low
[ "$status" = "🔋" ] && [ "$capacity" -le 25 ] && warn="❗"
# Prints the info
printf "%s%s%d%%" "$status " "$warn" " $capacity"; unset warn
done && printf "\\n"
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