[deprecated] Bash script to upgrade Terraform to the latest minor or major release on Linux

terraform-upgrade.sh

#!/bin/bash

url="https://releases.hashicorp.com/terraform"
latest_version=`curl -s ${url}/ | grep -A6 "<a href=\"../\">../</a>" | grep terraform | cut -d '_' -f 2 | cut -d '<' -f 1`
bin="/usr/local/bin/terraform"

install () {
  cd /tmp && \
  /bin/wget -q ${url}/${latest_version}/terraform_${latest_version}_linux_amd64.zip && \
  /bin/unzip -qq terraform_${latest_version}_linux_amd64.zip
  sudo cp terraform ${bin} && sudo cp terraform ${bin}-${latest_version}
}

install_minor () {
  cd /tmp && \
  /bin/wget -q ${url}/${minor_version}/terraform_${minor_version}_linux_amd64.zip && \
  /bin/unzip -qq terraform_${minor_version}_linux_amd64.zip
  sudo cp terraform ${bin} && sudo cp terraform ${bin}-${minor_version}
}

if [ ! -f "${bin}" ]; then
  echo "Installing Terraform v${latest_version}"
  install && echo "Terraform v${latest_version} installed"
else
  cur_version=`${bin} version | head -1 | cut -d 'v' -f 2`
  minor_version=`curl -s ${url}/ | grep ${cur_version:0:4} | head -1 | cut -d '_' -f 2 | cut -d '<' -f 1`
  echo "You're using Terraform ${cur_version}"
  if [ "${minor_version}" != "${cur_version}" ]; then
    echo "A new Terraform minor release is available: v${minor_version}"
    echo -n "Do you want to install this new minor release (y/n)? "
    read answer
    if [ "$answer" != "${answer#[Yy]}" ]; then
      install_minor && echo "Terraform updated to the latest release"
    else
      echo "Skipped the Terraform update to v${minor_version} release"
    fi
  fi
  if [ "${latest_version}" != "${cur_version}" ]; then
    echo "A new Terraform release is available: v${latest_version}"
    echo -n "Do you want to install this new release (y/n)? "
    read answer
    if [ "$answer" != "${answer#[Yy]}" ]; then
      install && echo "Terraform updated to the latest release"
    else
      echo "Skipped the Terraform update to v${latest_version} release"
    fi
  else
    echo "You're already running the latest release"
  fi
fi