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#!/bin/sh
unset QUIET MILLIWATTS TOTAL
BATTERY="ALL"
while getopts "b:mqt" o; do case "${o}" in
q) QUIET="y" ;;
m) MILLIWATTS="y" ;;
t)
TOTAL="y"
BATTERY="ALL"
;;
b) BATTERY="$OPTARG" ;;
esac done
error () {
printf "%s\n" "$@"
exit 1
}
#TOTALPOWER='0'
case "$BATTERY" in
"ALL")
ls -1 /sys/class/power_supply | grep -q 'BAT' || error "Are there no batteries?"
for battery in $(ls -1 /sys/class/power_supply | grep 'BAT'); do
DIRNAME="/sys/class/power_supply/${battery}"
if [ -f "${DIRNAME}/power_now" ]; then
if [ -n "${MILLIWATTS}" ]; then
POWER="$(cat "${DIRNAME}/power_now" | awk '{print $1/1e3}' | head -1)"
else
POWER="$(cat "${DIRNAME}/power_now" | awk '{print $1/1e6}' | head -1)"
fi
elif [ -f "${DIRNAME}/current_now" ]; then
if [ -n "${MILLIWATTS}" ]; then
POWER="$(cat "${DIRNAME}/current_now" "${DIRNAME}/voltage_now" | paste -d' ' -s | awk '{print $1*$2/1e9}' | head -1)"
else
POWER="$(cat "${DIRNAME}/current_now" "${DIRNAME}/voltage_now" | paste -d' ' -s | awk '{print $1*$2/1e12}' | head -1)"
fi
fi
if [ -n "${TOTAL}" ]; then
TOTALPOWER="$(echo "${TOTALPOWER}" "${POWER}" | awk '{print $1+$2}'| head -1)"
else
if [ -z "${QUIET}" ]; then
printf "Power in ${battery} is "
fi
printf "${POWER}"
if [ -n "${MILLIWATTS}" ]; then
echo " mW"
else
echo " W"
fi
fi
done
if [ -n "${TOTAL}" ]; then
if [ -z "${QUIET}" ]; then
printf "Total power is "
fi
printf "${TOTALPOWER}"
if [ -n "${MILLIWATTS}" ]; then
echo " mW"
else
echo " W"
fi
fi
;;
*)
DIRNAME="/sys/class/power_supply/${BATTERY}"
[ -d "${DIRNAME}" ] || error "No such battery!"
if [ -f "${DIRNAME}/power_now" ]; then
if [ -n "${MILLIWATTS}" ]; then
POWER="$(cat "${DIRNAME}/power_now" | awk '{print $1/1e3}' | head -1)"
else
POWER="$(cat "${DIRNAME}/power_now" | awk '{print $1/1e6}' | head -1)"
fi
elif [ -f "${DIRNAME}/current_now" ]; then
if [ -n "${MILLIWATTS}" ]; then
POWER="$(cat "${DIRNAME}/current_now" "${DIRNAME}/voltage_now" | paste -d' ' -s | awk '{print $1*$2/1e9}' | head -1)"
else
POWER="$(cat "${DIRNAME}/current_now" "${DIRNAME}/voltage_now" | paste -d' ' -s | awk '{print $1*$2/1e12}' | head -1)"
fi
fi
if [ -z "${QUIET}" ]; then
printf "Power in ${BATTERY} is "
fi
printf "${POWER}"
if [ -n "${MILLIWATTS}" ]; then
echo " mW"
else
echo " W"
fi
;;
esac
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