CPU Temperature Monitor Script

#!/bin/bash

# Written by Charlie Cook on June 4th, 2020

# Tested on a AMD Phenom 9500; Check your own machine
# by running `sensors`, and alter the awk regex
# (the string between the slashes) in this script
# to fit what your CPU temperature is labelled.

# (You may also need to tweak the numbers in substr(),
# it works as follows; substr($N,J,K)
# * N: field in the line where the temperature reading is (from 1)
# * J: which character in the Nth field to start from (from 1)
# * K: how many characters to take for the substring

# Check if there is a first argument and use it as the sleep delay if so
if [ -z $1 ]
then
    s=1
else
    s=$1
fi

# Sensor Poll counter
i=6

while :
do
    # Get the UNIX timestamp currently to pair with our polled temp reading
    t=$(date +%s)
    # Poll the sensor, format the temperature with awk, append to data file
    sensors -u | awk -F ":" -v t=$t '/temp1_input/ {print t,substr($2,2,4)}' >> ~/temperatureData.dat
    # Determine how many graph lines to show based on number of polled readings
    if (( $i < $LINES ))
    then
        l=$i
        let "i++"
    else
        l=$LINES
    fi
    # Feed latest readings, accounting for graph title lines, to termgraph
    tail -n $(( $l - 5 )) ~/temperatureData.dat | termgraph --color blue --no-labels --title "[$(hostname)] CPU Temperature (Celcius)"
    # Delay before polling again
    sleep $s
done