Log CPU temperatures in Ubuntu

tempmon.sh

#!/bin/bash

#
# A script to log your CPU temps to a file.
# https://gist.github.com/squarefrog/09daf36988136ebe061601afe58f2df8
# 
# You can set this script to run every X minutes using `cron`:
#
#   $ sudo crontab -u username -e
#
# To run every 10 minutes, add the following line to your crontab:
#
#   */10 * * * * /path/to/this/script/tempmon.sh
#

# Maximum number of log entries.
MAX_LOGS=52560 # 365 days at one reading every 10 minutes.

# Where to store the temperatures
FILENAME="/home/username/cpu-temp/results.tsv"

# Number of CPU cores
CORES=4


VALUES=$(date '+%Y-%m-%d %H:%M:%S')

for i in {1..CORES}
do
  TEMP=`cat /sys/class/thermal/thermal_zone${i}/temp`
  VALUE=$(bc <<< "scale=1; $TEMP/1000")
  VALUES+="\t$VALUE"
done

if [[ -e "$FILENAME" ]]; then
  FILE=`cat ${FILENAME}`
  FILE+="\n"
fi

RESULT="$FILE$VALUES"
printf "$RESULT" | tail -n $MAX_LOGS > $FILENAME