Install Digital Ocean doctl latest version automatically (bash script / shell script)

install_doctl.sh

#!/bin/bash

function install_doctl() {
  echo "Install doctl"
  curl -L $(curl -s https://api.github.com/repos/digitalocean/doctl/releases/latest \
  | grep browser_download_url \
  | grep linux-amd64 \
  | cut -d '"' -f 4) \
  | tar xvz

  mv ./doctl /usr/local/bin
}

function main () {
  if [[ $EUID -ne 0 ]]; then
    sudo $(realpath "$0")
    exit
  fi

  install_doctl

  echo "All Done..."
}

main "$@"

this script will prompt super user password if you running it for non-root user