System Monitor (CPU average frequency, maximum temperature and free total memory)

system_monitor.sh

#!/bin/bash

function cpufreq() {
    cat /proc/cpuinfo | grep MHz | awk -F ': ' '{print $2}' | sort -u
}

function temperature() {
    sensors | awk -F ':' '{print $2}' | awk '{print $1}' | grep "°C" | sed "s/+\|°C//g" | sort -u
}

function memory() {
    free -ht | grep 'Total' | awk '{print $4}' | sed "s/,/./g"
}

function calculateAverage() {
    local rows=$@
    total=0
    sum=0
    for row in ${rows}; do
        sum=$(python3 -c "print(float($sum) + float($row))")
        total=$(expr $total + 1)
    done
    average=$(python3 -c "print('{:.2f}'.format(float($sum) / float($total)))")
    echo $average
}

function calculateMax() {
    local rows=$@
    max=0
    for row in ${rows}; do
        if (( $(echo "$row > $max" | bc -l) )); then
            max=$row
        fi
    done
    echo $max
}

function iteration() {
    averageFreq=$(calculateAverage $(cpufreq))
    maxTemp=$(calculateMax $(temperature))
    echo "${averageFreq}㎒ ${maxTemp}°C $(memory)"
}

function cleanup() {
    kill -s SIGTERM $!
    exit 0
}

trap cleanup SIGINT SIGTERM

while [ 1 ]; do
    iteration
    sleep 3 &
    wait $!
done