Shell script to install Docker CE on ubuntu and post-install user configuration

ubuntudocker.sh

#!/bin/bash
sudo apt-get install -y \
    apt-transport-https \
    ca-certificates \
    curl \
    software-properties-common
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
sudo apt-key fingerprint 0EBFCD88
sudo add-apt-repository \
   "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
   $(lsb_release -cs) \
   stable"
sudo apt-get update
sudo apt-get install -y docker-ce
sudo docker run hello-world
# Linux post-install
sudo groupadd docker
sudo usermod -aG docker $USER
sudo systemctl enable docker

Download and run with:
wget -O - https://gist.githubusercontent.com/fredhsu/f3d927d765727181767b3b13a3a23704/raw/3c2c55f185e23268f7fce399539cb6f1f3c45146/ubuntudocker.sh | bash

NOTE if running Ubuntu 17.04 (zesty) you will need to manually add the xenial repo as zesty is not supported yet.

how to do it in centos?

to do that you just to change apt command to yum command it will run

will it work on ubuntu 20

it only works for ubuntu