#!/bin/bash

# ©2011 J. S. Gilstrap (KD5TVJ)
# GNU GPL2 License.  https://www.gnu.org/licenses
# This monitor is designed to pull the temperature
# out of /proc on a Linux kernel. It may be adaptable
# to port to other kernels. Edit lines 21 & 22 to
# retreive cputmp and filter it for display.

# Remove the .txt from the name, place in the PATH, 'chmod 755', and run it.

# Temperture trigger levels in °C.
Red=70 ; Yellow=60 ; Green=50 ; Sleep=15

if [ "$1" = temp ]
then
	clear

	while :
	do
		# Capture and filter CPU Temperature.
		T=$(< /proc/acpi/thermal_zone/THRM/temperature)
		T=${T#* } ; T=${T% *} ; T=$((T))

		# Set font color depending on temperture range.
		if [ $T -gt $Red ]
		then
			printf ""
			FG=""
			# Log any temperature readings in the RED.
			printf "CPU: ${T}°C   `date`\n" >> ${HOME}/tmprtr.log

		elif [ $T -gt $Yellow ]
		then
			FG=""

		elif [ $T -gt $Green ]
		then
			FG=""
		else
			FG=""
		fi

		# Print CPU temperature.
		printf  "\r ${FG}CPU ${T}°C"
		sleep $Sleep
	done
else
	# Start or restart monitor. 
	PID=$(ps aux | grep "${USER}.*xterm.*tmprtr" | grep -v grep | awk '{print $2}')
	((PID)) && { kill $PID ; sleep 0.333 ; } ; [ -n "$1" ] && (($1)) && ofst=+${1}
	exec xterm -bg rgb:70/00/C0 -cr rgb:70/00/C0 -fn 10x20 -geometry 10x1${ofst} +sb -e $0 temp &
fi