Script for use with M/Monit to monitor CPU core temperature

CPUTemp.sh

#!/bin/sh -e
##
## Title:                     CPUTemp.sh
## Description:               Script for use with M/Monit to monitor CPU core temperature
## Author:                    B. van wetten
## Created date:              21-01-2020
## Updated date:              23-01-2020
## Version:                   0.3
## GitHub Gist:               https://gist.github.com/QNimbus/529ab50d7293a42f7bb2924c27b4b951
##
## Usage:                     CPUTemp.sh [max_temp]
## Sample M/Monit condition:  status != 0 for 3 times within 5 cycles
## Notes:                     Exit code 0 when no CPU core temperature is greater than 'max_temp'
##                            otherwise exitcode is equal to max core temperature.
##                            If no command line parameter is supplied 'max_temp' equals 60 degrees

MaxCPUTemp=${1:-60}
NumCPUs=`sysctl -n kern.smp.cpus`
CurrentCPU=0
ExitCode=0

while [ $CurrentCPU -lt $NumCPUs ]
do
   CPUTemp=`sysctl dev.cpu.$CurrentCPU.temperature | awk '{print $2}' | awk -F. '{print $1}'`
   echo "CPU core ${CurrentCPU} temperature: ${CPUTemp}"

   if [ $CPUTemp -gt $MaxCPUTemp ] && [ $CPUTemp -gt $ExitCode ]
   then
      ExitCode=$CPUTemp
   fi

   CurrentCPU=$((CurrentCPU+1))
done

echo "Maximum CPU core temperature allowed: ${MaxCPUTemp}"

exit $ExitCode