Terraform update bash script

tf-version.sh

function tf-version() {
  if [ -z $1 ]; then
    echo "You must specify the version!"
    return
  fi
  echo "Switching to terraform version $1"
  if [ ! -f /usr/local/Cellar/terraform/$1/terraform ]; then
    echo "New version of terraform, downloading..."
    curl -S https://releases.hashicorp.com/terraform/$1/terraform_$1_darwin_amd64.zip > /tmp/tf_$1.zip \
      && cd /tmp \
      && unzip /tmp/tf_$1.zip \
      && mkdir -p /usr/local/Cellar/terraform/$1/ \
      && mv terraform /usr/local/Cellar/terraform/$1/ \
      && rm /tmp/tf_$1.zip \
      && cd -
  fi
  rm /usr/local/bin/terraform
  ln -s /usr/local/Cellar/terraform/$1/terraform /usr/local/bin/terraform
  echo "Confirming version from binary:"
  terraform --version
}