check_rpi_temperature

#!/bin/bash
# author: Andrea Cattaneo
# check raspberry pi cpu temperature with perfdata and warn/crit thresholds
#
# check raspberry pi temperature with perfdata and warn/crit thresholds.
# The data is read from sysfs ( file: /sys/class/thermal/thermal_zone0/temp ).
#
# Dependency: awk bc
# licence: GPL
if [ -z "$1" ] ; then
    echo "UNKNOWN - missing warning temperature"
    exit 3
fi
WARN=$1

if [ -z "$2" ] ; then
    echo "UNKNOWN - missing critical temperature"
    exit 3
fi
CRIT=$2

if ! ( command -v awk >/dev/null ) ; then
    echo "UNKNOWN - awk command not found"
    exit 3
fi

if ! ( command -v bc >/dev/null ) ; then
    echo "UNKNOWN - bc command not found"
    exit 3
fi

if ! [[ -f /sys/class/thermal/thermal_zone0/temp ]] ; then
    echo "UNKNOWN - /sys/class/thermal/thermal_zone0/temp: No such file"
    exit 3
fi
TEMP=`awk '{printf "%3.1f", $1/1000}' /sys/class/thermal/thermal_zone0/temp`

if (( $(echo "${TEMP} > ${CRIT}" | bc -l) )); then
    echo "TEMPERATURE CRITICAL - CPU Temp: ${TEMP} °C | cpu_temp=${TEMP};${WARN};${CRIT};;"
    exit 2
fi

if (( $(echo "${TEMP} > ${WARN}" | bc -l) )); then
    echo "TEMPERATURE WARNING - CPU Temp: ${TEMP} °C | cpu_temp=${TEMP};${WARN};${CRIT};;"
    exit 1
fi

echo "TEMPERATURE OK - CPU Temp: ${TEMP} °C | cpu_temp=${TEMP};${WARN};${CRIT};;"
exit 0