update ds18b20 sample code

guowenxue

2019-07-21 1677e7c0cd68ba171b02828acac56938dbfec73a

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#!/bin/bash
# This shell script used to install wiringPi library
 
gpio -v > /dev/null 
if [ $? == 0 ] ; then
    echo "wiringPi library already installed, exit now..."
    exit;
fi
 
if [ ! -d wiringPi ] ; then
    git clone git://git.drogon.net/wiringPi 
fi
 
cd wiringPi 
git pull origin
./build