#! /bin/bash

cd /usr/share/nginx/html/learn

export oldDog=$(cat $1_dog.txt)
echo 'oldDog: '$oldDog
if [ $oldDog = 'cream' ];then
cp golden.png.bak $1_dog.png
echo golden > $1_dog.txt
echo 'newDog: golden'
elif [ $oldDog = 'golden' ];then
cp cream.png.bak $1_dog.png
echo cream > $1_dog.txt
echo 'newDog: cream'
fi;