battery_temperature for mac osx 10.9.2 using ioreg

battery_temperature.sh

#!/bin/bash
# battery_temperature for mac osx 10.9.2
if [ `uname` == "Darwin" ]; then

  if [ "$1" == "-h" ]; then
    echo "Usage: $(basename $0 ".sh") [option]"
    echo "  -l also show Model Name and Processor Name"
    echo "  -h display this help message"
    exit
  fi

  # -l display Model Name and Processor Name
  if [ "$1" == "-l" ]; then
    system_profiler SPHardwareDataType | awk '/Model Name/ || /Processor Name/' | sed 's/[^:]*: //' | awk '{ printf $0 "  " }'
    echo
  fi

  # sensor data
  temperature=`ioreg -r -n AppleSmartBattery | grep Temperature | cut -c23-`
  temperature_celsius=`echo $temperature / 100.0 | bc`
  echo "AppleSmartBattery Temperature: "
  echo $temperature_celsius °C
  temperature_fahrenheit=`echo "($temperature_celsius * (9 / 5)) + 32.0" | bc`
  echo $temperature_fahrenheit °F

# error message if unsupported machine
else
  echo -e "\nThis appears not to be an OS X machine\n"
fi

Thanks for this script!

One correction: The lines sent to bc need to start with scale = 2\; or you lose all fractions. Currently, the result of (9 / 5) is getting truncated to 1, so 30ºC is getting displayed as 62ºF, that is, 30 * 1 + 32.

bkovitz, could you either post a fixed gist or write the line(s) in question in the comments so that we can see what you mean?

Nevermind. Fixed in my fork.

Thank you so much! 👍

what about cpu temp?

Using iStats, you get a different reading for the battery temperature than using this. So i collected ˜10 days of by-minute data from both, ioreg and istats. Compared them, ran a linear regression and now i have the theory that the value from ioreg -r -n AppleSmartBattery is in Kelvin tenths. Does anyone have more info on these units ?