Script to print CPU temperature in a while loop to STDOUT

print_cpu_temperature.sh

#!/usr/bin/env bash
# Script to print CPU temperature in a while loop to STDOUT
if [ -z $1 ]; then
    echo "Required THERMAL_ZONE arg not given." 1>&2
    echo "List thermal zones and types with:" 1>&2
    echo "  grep . /sys/class/thermal/thermal_zone*/type" 1>&2
    echo "" 1>&2
    echo "Usage:" 1>&2
    echo "  $0 THERMAL_ZONE [SECONDS_BETWEEN_READINGS]" 1>&2
    exit 1;
fi

echo "\"stamp\",\"thermal_zone${1}\""

while [ 1 ]; do

    ## Get a list of core temps and record the max?
    ## grep . /sys/devices/platform/coretemp.0/hwmon/hwmon*/temp*_input

    # temps=$(cat /sys/devices/platform/coretemp.0/hwmon/hwmon*/temp*_input);
    # max_temp=0
    # for temp in $temps; do
    #     if [ "$temp" -gt "$max_temp" ]; then
    #         max_temp=$temp
    #     fi
    # done
    # cpu_temp=$(($max_temp / 1000))

    # https://leo3418.github.io/2021/02/09/linux-cpu-freq-temp-mon-script.html
    cpu_temp=$(($(cat "/sys/class/thermal/thermal_zone${1}/temp") / 1000))
    echo "\"$(date -Iseconds)\", ${cpu_temp}"
    sleep ${2:-1}
done