RaspberryPi 4 temperature logging

temp.sh

#!/bin/bash

# Run this script in cron, for example:
# */5 * * * * /home/user/temp.sh >> /home/user/temp_log.tsv

timestamp=`date "+%Y/%m/%d %H:%M:%S"`

temperature=`sudo cat /sys/class/thermal/thermal_zone0/temp`
cpu_frequency=`sudo cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq`

# `bc` is required, install it with `apt install bc`
temperature_calculated=`echo "scale=2; ${temperature}/1000" | bc`
frequency_calculated=`echo "scale=2; ${cpu_frequency}/1000" | bc`

echo -e "${timestamp}\t${temperature_calculated}\t${frequency_calculated}"