Automatic update Terraform

update_terraform.sh

#!/usr/bin/env bash
#Defining Terrafrom Directory
INSTALL_DIR="/opt/terraform" 
#Terrafrom URL
URL="https://releases.hashicorp.com/terraform" 
#Getting local version
LOCAL_VER="0"
if [ -x "$(command -v terraform)" ]; then
LOCAL_VER=$(terraform -version | grep -v "+" | awk -Fv '{print $2}')
fi
#Getting Online Version
VER="$(curl -sL $URL | grep -v beta | grep -Po "_(\d*\.?){3}" | sed 's/_//' | sort -V | tail -1)"
#Defining Download file name
ZIP="terraform_${VER}_linux_amd64.zip"
if  [ "$LOCAL_VER" = "$VER" ]; then
    echo "Terraform v$VER is alreay up to date"
elif [ "$EUID" -ne 0 ];  then   
    echo "Please run as root"
    echo "Terraform v$VER update is available for update"
else 
    mkdir -p "$INSTALL_DIR"
    echo "Currently installed Terrafrom v\"$LOCAL_VER\" is out of date. "
    echo "* Downloading ${URL}/${VER}/terraform_${VER}_linux_amd64.zip"
    curl -s ${URL}/"${VER}"/terraform_"${VER}"_linux_amd64.zip -o "${INSTALL_DIR}"/"${ZIP}"
    echo "* Extracting $ZIP into $INSTALL_DIR"
    unzip -o "${INSTALL_DIR}"/"$ZIP" -d "$INSTALL_DIR" && rm -v "${INSTALL_DIR}"/"$ZIP"
    ln -sf "${INSTALL_DIR}"/terraform /usr/bin/ #Creating Symbolc link in /usr/bin
fi