#/bin/bash

while (true); do

# check temperature
temp=`cat /proc/acpi/thermal_zone/THRM/temperature | awk {'print $2'}`
echo "Current temperature: $temp"

# turn fan on when too warm
if [[ "$temp" -ge "50" ]];
then
echo -n 0 >/proc/acpi/fan/FAN/state
fi

# turn fan on when too warm
if [[ "$temp" -le "45" ]];
then
echo -n 3 >/proc/acpi/fan/FAN/state
fi

sleep 30
done