Get temperatures from Synology running DSM 6.x

get_synology_cpu_temperature.sh

#!/bin/bash

# Simple script to get all the values from the temperature sensors on your
# Synology device running DSM 6.x.
# Only tested on my DS415play (2 core Atom CE5335), YMMV.
# 
# Sample output:
#
# $ ./get_synology_cpu_temperature.sh 
# temp2 (Core 0): current 40°C, critical at 100°C 
# temp3 (Core 1): current 41°C, critical at 100°C 
#
# If there is currently an over-temperature alarm, the output will be:
# `temp2 (Core 0): current 101°C, critical at 100°C !! TEMPERATURE WARNING !!`
#

device_path=/sys/class/hwmon/hwmon0/device

for sensor_name in $(ls -1 $device_path | egrep -o 'temp[[:digit:]]{1}' | sort -u); do
  crit_file="${device_path}/${sensor_name}_crit"
  crit_alarm_file="${device_path}/${sensor_name}_crit_alarm"
  label_file="${device_path}/${sensor_name}_label"
  input_file="${device_path}/${sensor_name}_input"

  input_value=$(<$input_file)
  input_value=$(expr $input_value / 1000)
  label_value=$(<$label_file)
  crit_value=$(<$crit_file)
  crit_value=$(expr $crit_value / 1000)
  crit_alarm_value=$(<$crit_alarm_file)

  if [ $crit_alarm_value -ne "0" ]; then
    critical_alarm_triggered="!! TEMPERATURE WARNING !!"
  fi

  echo "${sensor_name} (${label_value}): current ${input_value}°C, critical at ${crit_value}°C ${critical_alarm_triggered}"
done