get temperature from ds18b20 on RPi in Bash

ds18b20.sh

#!/bin/bash

modprobe w1-gpio
modprobe w1-therm

if [ -d /sys/bus/w1/devices ]; then
	id=$(ls /sys/bus/w1/devices/ | head -n 1);
	temperature=$(tail -n 1 /sys/bus/w1/devices/$id/driver/$id/w1_slave | grep -o "[-0-9]*$") 
	echo "scale=3;" $temperature "/ 1000.0" | bc
	
fi