Raspberry pi 4 CPU Temp and Frequency

cputemp.sh

#!/bin/bash
#----------------------------------------------------------------------------------------
# Obtains the current value of the CPU temperature.
#----------------------------------------------------------------------------------------
function get_cpu_temp()
{
  # Initialize the result.
  local result=0.00
  # The first line in this file holds the CPU temperature as an integer times 1000.
  # Read the first line from the file.
  line=$(head -n 1 /sys/class/thermal/thermal_zone0/temp)
  # Test if the string is an integer as expected with a regular expression.
  if [[ $line =~ ^-?[0-9]+$ ]]
  then
    # Convert the CPU temperature to degrees Celsius and store as a string.
    result=$(awk "BEGIN {printf \"%.2f\n\", $line/1000}")
  fi
  # Give the result back to the caller.
  echo "$result"
}

#----------------------------------------------------------------------------------------
# Obtains the current value of the CPU frequency.
#----------------------------------------------------------------------------------------
function get_cpu_freq()
{
  # Initialize the result.
  local result=0.00
  # The first line in this file holds the CPU temperature as an integer times 1000.
  # Read the first line from the file.
  line=$(head -n 1 /sys/devices/system/cpu/cpu$1/cpufreq/scaling_cur_freq)
  # Test if the string is an integer as expected with a regular expression.
  if [[ $line =~ ^-?[0-9]+$ ]]
  then
    # Convert the CPU temperature to degrees Celsius and store as a string.
    result=$(awk "BEGIN {printf \"%.2f\n\", $line/1000}")
  fi
  # Give the result back to the caller.
  echo "$result"
}
#----------------------------------------------------------------------------------------
# Program to demonstrate how to obtain the current value of the CPU temperature.
#----------------------------------------------------------------------------------------
cputemp=$(get_cpu_temp)
echo -e "Current CPU temperature is $cputemp degrees Celsius."

cpufreq0=$(get_cpu_freq 0)
echo -e "Current CPU frequency for core 0 is $cpufreq0 Mhz."
cpufreq1=$(get_cpu_freq 1)
echo -e "Current CPU frequency for core 0 is $cpufreq1 Mhz."
cpufreq2=$(get_cpu_freq 2)
echo -e "Current CPU frequency for core 0 is $cpufreq2 Mhz."
cpufreq3=$(get_cpu_freq 3)
echo -e "Current CPU frequency for core 0 is $cpufreq3 Mhz."