Shell script to setup a new VPS

The shell script below can be used to setup a new VPS running Ubuntu. It performs the following actions:

1. Create a new ssh username and password.
2. Disables root login.
3. Disables swap.
4. Installs Docker.
5. Creates a few alias commands for the user.

#!/bin/sh

###################################
####### EDIT THIS SECTION #########
USERNAME="<enter username>"
PASSWORD="<enter secure password or see below to auto-generate>"
###################################

PASSWD="head /dev/urandom | tr -dc A-Za-z0-9 | head -c 16 ; echo ''"
#Uncomment line below to set an auto-generated password. The password will be displayed at the end of this process.
PASSWORD=$(eval "$PASSWD")

echo "USERNAME: "$USERNAME
echo "PASSWORD: "$PASSWORD

adduser --disabled-password --gecos "" $USERNAME && echo "$USERNAME:$PASSWORD" | chpasswd && echo "$USERNAME ALL=(ALL) NOPASSWD:ALL" > /etc/sudoers.d/$USERNAME && sed -i 's/PermitRootLogin yes/PermitRootLogin no/g' /etc/ssh/sshd_config && service sshd restart

swapoff -a
sed -i '/swapfile/d' /etc/fstab

apt update -y && apt upgrade -y && apt install -y vim sudo net-tools apt-transport-https ca-certificates software-properties-common docker.io && usermod -aG docker $USERNAME && systemctl start docker &&  systemctl enable docker

cat <<EOT >> /home/$USERNAME/.bashrc

export HISTSIZE=
export HISTFILESIZE=

bind '"\e[A":history-search-backward'
bind '"\e[B":history-search-forward'

alias di='docker images'
alias dc='docker ps -a'
alias dv='docker volume ls'
alias dl='docker container logs -f'
alias up='docker-compose up -d'
alias dn='docker-compose down'
alias lg='docker-compose logs -f'

alias gs='git status'
alias gp='git pull && gs'
alias glf='git log -p'
alias gl='git log --graph --pretty=oneline --abbrev-commit'
alias gd='git diff'
alias gcm='git checkout master && gs'
alias gcd='git checkout develop && gs'
alias gcp='git checkout production && gs'
alias gc.='git checkout . && gs'

alias vb='vim ~/.bashrc'
alias vh='sudo vim /etc/hosts'
alias sb='source ~/.bashrc'

alias f='free -m'
alias u='uptime'
alias n='sudo netstat -punta | grep LISTEN'
alias i='ifconfig'
alias j='jobs -l'
alias l='ls -falh'
alias d='df -h'
alias k='sudo kill -9'
alias s='du -sh * | sort -h'
alias t='ls -t -1'
alias h='history | grep'
alias p='ps -ef | grep'
alias kj='k $(j | awk {print $2})'

EOT

echo "USERNAME: "$USERNAME
echo "PASSWORD: "$PASSWORD

init 6