summarize this code below: #!/usr/bin/env bash

# Setting error handler
handle_error() {
    local line=$1
    local exit_code=$?
    echo "An error occurred on line $line with exit status $exit_code"
    exit $exit_code
}

trap 'handle_error $LINENO' ERR
set -e

# Retrieve server IP
server_ip=$(hostname -I | awk '{print $1}')

# Setting up colors for echo commands
YELLOW='\033[1;33m'
GREEN='\033[0;32m'
RED='\033[0;31m'
LIGHT_BLUE='\033[1;34m'
NC='\033[0m' # No Color

# Checking Supported OS and distribution
SUPPORTED_DISTRIBUTIONS=("Ubuntu" "Debian")
SUPPORTED_VERSIONS=("22.04" "20.04" "11" "10" "9" "8")

check_os() {
    local os_name=$(lsb_release -is)
    local os_version=$(lsb_release -rs)
    local os_supported=false
    local version_supported=false

    for i in "${SUPPORTED_DISTRIBUTIONS[@]}"; do
        if [[ "$i" = "$os_name" ]]; then
            os_supported=true
            break
        fi
    done

    for i in "${SUPPORTED_VERSIONS[@]}"; do
        if [[ "$i" = "$os_version" ]]; then
            version_supported=true
            break
        fi
    done

    if [[ "$os_supported" = false ]] || [[ "$version_supported" = false ]]; then
        echo -e "${RED}This script is not compatible with your operating system or its version.${NC}"
        exit 1
    fi
}

check_os


# Detect the platform (similar to $OSTYPE)
OS="`uname`"
case $OS in
  'Linux')
    OS='Linux'
    if [ -f /etc/redhat-release ] ; then
      DISTRO='CentOS'
    elif [ -f /etc/debian_version ] ; then
      if [ "$(lsb_release -si)" == "Ubuntu" ]; then
        DISTRO='Ubuntu'
      else
        DISTRO='Debian'
      fi
    fi
    ;;
  *) ;;
esac


ask_twice() {
    local prompt="$1"
    local secret="$2"
    local val1 val2

    while true; do
        if [ "$secret" = "true" ]; then

            read -rsp "$prompt: " val1

            echo >&2
        else
            read -rp "$prompt: " val1
            echo >&2
        fi
        
        if [ "$secret" = "true" ]; then
            read -rsp "Confirm password: " val2
            echo >&2
        else
            read -rp "Confirm password: " val2
            echo >&2
        fi

        if [ "$val1" = "$val2" ]; then
            printf "${GREEN}Password confirmed${NC}" >&2
            echo "$val1"
            break
        else
            printf "${RED}Inputs do not match. Please try again${NC}\n" >&2
            echo -e "\n"
        fi
    done
}
echo -e "\n"
echo -e "${LIGHT_BLUE}Welcome to the ERPNext Installer...${NC}"
echo -e "\n"
sleep 3

#First Let's take you home
cd $(sud Please repeat the request first, then give your response.
user