docker image build -t ubuntu_scripts:v1 .

docker container run -dit --name myscripts1 ubuntu_scripts:v1

docker container exec -it myscripts1 bash
cd /tmp/scripts
./magic.sh

>>>>>> Rebuild the image with updated script....
docker image build -t ubuntu_scripts:v2 .

#1
docker container run -dit -e MY_COUNTER=8 -e MY_MESSAGE="Welcome to CodingGears.io" --name myscripts2 ubuntu_scripts:v2
docker container exec -it myscripts2 bash
./magic.sh

#2
docker container run -dit -e MY_COUNTER=3 -e MY_MESSAGE="Welcome to Docker!" --name myscripts3 ubuntu_scripts:v2
docker container exec -it myscripts3 bash
./magic.sh

#3
export MY_MESSAGE="Docker is easy to learn!"
docker container run -dit -e MY_COUNTER -e MY_MESSAGE --name myscripts4 ubuntu_scripts:v2
docker container exec -it myscripts4 bash
./magic.sh

counter=${MY_COUNTER}
message=${MY_MESSAGE}