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#!/bin/sh
unset QUIET MILLIWATTS TOTAL
BATTERY="ALL"
printhelp () {
printf "power_now: get the current power draw from the battery.\n"
printf "\t-q) print only the number\n"
printf "\t-m) use milliwatts instead of watts\n"
printf "\t-t) use the total of all batteries\n"
printf "\t-b X) use battery X\n"
exit 1
}
while getopts "b:mqt" o; do case "${o}" in
q) QUIET="y" ;;
m) MILLIWATTS="y" ;;
t)
TOTAL="y"
BATTERY="ALL"
;;
b) BATTERY="$OPTARG" ;;
*) printhelp ;;
esac done
error () {
printf "%s\n" "$@"
exit 1
}
#TOTALPOWER='0'
case "$BATTERY" in
"ALL")
find /sys/class/power_supply -name 'BAT*' || error "Are there no batteries?"
for battery in /sys/class/power_supply/BAT*; do
battery="$(basename "$battery")"
DIRNAME="/sys/class/power_supply/${battery}"
if [ -f "${DIRNAME}/power_now" ]; then
if [ -n "${MILLIWATTS}" ]; then
POWER="$(awk '{print $1/1e3}' "${DIRNAME}/power_now" | head -1)"
else
POWER="$(awk '{print $1/1e6}' "${DIRNAME}/power_now" | 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 %s is " "${battery}"
fi
printf "%s" "${POWER}"
if [ -n "${MILLIWATTS}" ]; then
echo " mW"
else
echo " W"
fi
fi
done
if [ -n "${TOTAL}" ]; then
if [ -z "${QUIET}" ]; then
printf "Total power is "
fi
printf "%s" "${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 "${MILLIWATTS}" ]; then
POWER="$(awk '{print $1/1e3}' "${DIRNAME}/power_now" | head -1)"
else
POWER="$(awk '{print $1/1e6}' "${DIRNAME}/power_now" | 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 %s is " "${BATTERY}"
fi
printf "%s" "${POWER}"
if [ -n "${MILLIWATTS}" ]; then
echo " mW"
else
echo " W"
fi
;;
esac
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