diff --git a/priv/script.sh b/priv/script.sh
index 03f228e9..9dff34d0 100755
--- a/priv/script.sh
+++ b/priv/script.sh
@@ -2,441 +2,489 @@
 
 set -eu
 
+elixir_version=1.17.3-otp-27
+erlang_version=27.1.2
+phoenix_version=1.7.14
+postgres_version=15.1
+
+OS="$(uname -s)"
+case "$OS" in
+Linux*) os_type=Linux ;;
+Darwin*) os_type=macOS ;;
+*)
+  printf >&2 "Unsupported OS: %s\n" "$OS"
+  exit 1
+  ;;
+esac
+
+has() {
+  command -V "${1:?}" >/dev/null 2>/dev/null
+}
+
+mise_has() {
+  mise which "${1:?}" >/dev/null 2>/dev/null
+}
+
+mise_has_version() {
+  has mise &&
+    mise_has "${1:?}" &&
+    [ "$(mise which --version "${1:?}")" = "${2:?}" ]
+}
+
 # Make sure important variables exist if not already defined
 #
 # $USER is defined by login(1) which is not always executed (e.g. containers)
 # POSIX: https://pubs.opengroup.org/onlinepubs/009695299/utilities/id.html
 USER=${USER:-$(id -u -n)}
+
 # $HOME is defined at the time of login, but it could be unset. If it is unset,
 # a tilde by itself (~) will not be expanded to the current user's home directory.
 # POSIX: https://pubs.opengroup.org/onlinepubs/009696899/basedefs/xbd_chap08.html#tag_08_03
-HOME="${HOME:-$(getent passwd $USER 2>/dev/null | cut -d: -f6)}"
-# macOS does not have getent, but this works even if $HOME is unset
-HOME="${HOME:-$(eval echo ~$USER)}"
-
-bold='\033[1m'
-normal='\033[0m'
-red='\033[0;31m'
-blue='\033[0;34m'
-bblue='\033[1;34m'
-white='\033[0;37m'
-green='\033[0;32m'
-cyan='\033[0;36m'
-
-elixir_version=1.17.2-otp-27
-erlang_version=27.0.1
-phoenix_version=1.7.14
-postgres_version=15.1
+if [ -z "$HOME" ]; then
+  set +e
+  if [ "$os_type" = Linux ]; then
+    HOME="$(getent passwd "$USER" 2>/dev/null | cut -d: -f6)"
+  elif [ "$os_type" = macOS ]; then
+    HOME="$(dscl . -read /Users/"$USER" NFSHomeDirectory)"
+  fi
+
+  # If neither of the above commands works, fall back to `~$USER`.
+  HOME="${HOME:-$(eval echo ~"$USER")}"
+  set -e
+fi
+
+# Disable colour output if NO_COLOR is set to any value at all.
+# https://no-color.org
+if [ -n "${NO_COLOR:-}" ]; then
+  bold=''
+  normal=''
+  bblue=''
+  cyan=''
+elif has tput; then
+  # Prefer using `tput` for highlighting over manual ANSI colour codes. This
+  # would allow xterm 256 colour as well.
+  bold="$(tput bold)"
+  normal="$(tput sgr0)"
+  bblue="$(tput setaf 11)"
+  cyan="$(tput setaf 6)"
+else
+  bold='\033[1m'
+  normal='\033[0m'
+  bblue='\033[1;34m'
+  cyan='\033[0;36m'
+fi
+
+phx_tools_path="$HOME"/.config/phx_tools
+phx_tools_sh_path="$phx_tools_path"/phx_tools.sh
+phx_tools_fish_path="$phx_tools_path"/phx_tools.fish
+homebrew_path=
 
 case "${SHELL:-}" in
-*bash)
-    current_shell="bash"
-    config_file="$HOME/.bashrc"
-    ;;
-*fish)
-    current_shell="fish"
-    config_file="$HOME/.config/fish/config.fish"
-    mkdir -p "$(dirname "$config_file")"
-    ;;
-*zsh)
-    current_shell="zsh"
-    config_file="$HOME/.zshrc"
-    ;;
+*/bash | */fish | */zsh) : ;;
+'')
+  printf >&2 "Cannot discover shell, \$SHELL is unset.\n"
+  exit 1
+  ;;
 *)
-    printf "Unsupported shell: %s\n" "$SHELL"
-    exit 1
-    ;;
+  printf >&2 "Unsupported shell: %s\n" "$SHELL"
+  exit 1
+  ;;
 esac
 
-# Add OS detection
-OS="$(uname -s)"
-
 get_package_manager() {
-  if command -v apt-get >/dev/null; then
-    echo "apt"
-  elif command -v dnf >/dev/null; then
-    echo "dnf"
-  elif command -v pacman >/dev/null; then
-    echo "pacman"
-  elif command -v apk >/dev/null; then
-    echo "apk"
+  if has apt-get; then
+    echo apt
+  elif has dnf; then
+    echo dnf
+  elif has pacman; then
+    echo pacman
+  elif has apk; then
+    echo apk
   else
-    printf "Unsupported package manager. This script requires apt, dnf, pacman, or apk.\n"
+    printf >&2 "Unsupported package manager.\n"
+    printf >&2 "This script requires apt, dnf, pacman, or apk.\n"
     exit 1
   fi
 }
 
-case "${OS}" in
-  Linux*)
-    os_type=Linux
-    package_manager=$(get_package_manager)
-    ;;
-  Darwin*)
-    os_type=macOS
-    ;;
+if [ "$os_type" = macOS ]; then
+  package_manager=homebrew
+
+  if [ "$(uname -m)" = arm64 ]; then
+    homebrew_path=/opt/homebrew/bin
+  else
+    homebrew_path=/usr/local/bin
+  fi
+else
+  package_manager="$(get_package_manager)"
+fi
+
+already_installed() {
+  case "$1" in
+  Elixir) mise_has_version elixir "$elixir_version" ;;
+  Erlang) mise_has_version erl "$erlang_version" ;;
+  git) has git ;;
+  Homebrew) has brew ;;
+  mise) has mise ;;
+  Phoenix) has mix && mix phx.new --version >/dev/null 2>&1 ;;
+  PostgreSQL) mise_has initdb ;;
+  "Xcode Command Line Tools") has xcode-select ;;
   *)
-    printf "Unsupported OS: %s\n" "${OS}"
+    printf >&2 "Unknown tool provided for install check: %s\n" "$1"
     exit 1
     ;;
-esac
+  esac
+}
 
-already_installed() {
-    case "$1" in
-    "Elixir")
-        mise which elixir >/dev/null 2>&1
-        ;;
-    "Erlang")
-        mise which erl >/dev/null 2>&1
-        ;;
-    "git")
-        which git >/dev/null 2>&1
-        ;;
-    "Homebrew")
-        which brew >/dev/null 2>&1
-        ;;
-    "mise")
-        which mise >/dev/null 2>&1
-        ;;
-    "Phoenix")
-        mix phx.new --version >/dev/null 2>&1
-        ;;
-    "PostgreSQL")
-        mise which initdb >/dev/null 2>&1
-        ;;
-    "Xcode Command Line Tools")
-        which xcode-select >/dev/null 2>&1
-        ;;
-    *)
-        printf "Invalid name argument on checking: %s\n" "$1"
-        exit 1
-        ;;
+install_deps() {
+  case "$1" in
+  Elixir)
+    case "$package_manager" in
+    apt)
+      sudo apt-get update
+      sudo apt-get install -y unzip
+      ;;
+    dnf) sudo dnf install -y unzip ;;
+    pacman) sudo pacman -Sy --noconfirm unzip ;;
+    apk) sudo apk add --no-cache unzip ;;
+    esac
+    ;;
+  Erlang)
+    case "$package_manager" in
+    homebrew)
+      brew install autoconf openssl@3 wxwidgets libxslt fop
+
+      if [ ! -f "$HOME"/.kerlrc ]; then
+        printf "KERL_CONFIGURE_OPTIONS=\"--with-ssl=%s --without-javac\"\n" \
+          "'$(brew --prefix openssl@3)'" >"$HOME"/.kerlrc
+      fi
+
+      # shellcheck disable=SC3045
+      ulimit -n 1024
+      ;;
+    apt)
+      sudo apt-get update
+      sudo apt-get install -y build-essential automake autoconf libssl-dev \
+        libncurses5-dev
+      ;;
+    dnf)
+      sudo dnf groupinstall -y "Development Tools"
+      sudo dnf install -y openssl-devel ncurses-devel
+      ;;
+    pacman)
+      sudo pacman -Sy --noconfirm base-devel openssl ncurses
+      ;;
+    apk)
+      sudo apk add --no-cache build-base autoconf openssl-dev ncurses-dev
+      ;;
+    esac
+
+    if [ "$os_type" = Linux ] && [ ! -f "$HOME"/kerlrc ]; then
+      printf "KERL_CONFIGURE_OPTIONS=\"--without-javac\"\n" >"$HOME"/.kerlrc
+    fi
+    ;;
+  PostgreSQL)
+    case "$package_manager" in
+    homebrew) brew install gcc readline zlib curl ossp-uuid ;;
+    apt)
+      sudo apt-get update
+      sudo apt-get install -y linux-headers-generic build-essential \
+        libssl-dev libreadline-dev zlib1g-dev libcurl4-openssl-dev uuid-dev \
+        icu-devtools
+      ;;
+    dnf)
+      sudo dnf groupinstall -y "Development Tools"
+      sudo dnf install -y kernel-headers openssl-devel readline-devel \
+        zlib-devel libcurl-devel libuuid-devel libicu-devel
+      ;;
+    pacman)
+      sudo pacman -Sy --noconfirm linux-headers base-devel openssl readline \
+        zlib curl util-linux icu
+      ;;
+    apk)
+      sudo apk add --no-cache linux-headers build-base openssl-dev \
+        readline-dev zlib-dev curl-dev util-linux-dev icu-dev
+      ;;
     esac
+    ;;
+  esac
 }
 
 install() {
+  if [ -n "${DRY_RUN:-}" ]; then
+    return
+  fi
+
+  install_deps "$1"
+
+  case "$1" in
+  Elixir) mise use -g -y elixir@$elixir_version ;;
+  Erlang) mise use -g -y erlang@$erlang_version ;;
+  git)
+    case "$package_manager" in
+    "apt")
+      sudo apt-get update
+      sudo apt-get install -y git
+      ;;
+    "dnf")
+      sudo dnf install -y git
+      ;;
+    "pacman")
+      sudo pacman -Sy --noconfirm git
+      ;;
+    "apk")
+      sudo apk add --no-cache git
+      ;;
+    esac
+    ;;
+  Homebrew)
+    NONINTERACTIVE=1 /bin/bash -c \
+      "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
+
+    eval "$("$homebrew_path"/brew shellenv sh)"
+    ;;
+  mise)
+    curl https://mise.run | sh
+
+    export PATH="$HOME/.local/bin:$PATH"
+    ;;
+  Phoenix)
+    mise exec -- mix local.hex --force
+    mise exec -- mix local.rebar --force
+    mise exec -- mix archive.install --force hex phx_new $phoenix_version
+    ;;
+  PostgreSQL)
+    mise use -g -y postgres@$postgres_version
+    ;;
+  "Xcode Command Line Tools")
+    xcode-select --install
+    ;;
+  *)
+    printf >&2 "Unknown tool provided for install: %s\n" "$1"
+    exit 1
+    ;;
+  esac
+}
+
+maybe_install() {
+  if already_installed "$1"; then
+    printf "%s is already installed. Skipping...\n" "$1"
+  else
     case "$1" in
-    "Elixir")
-        if [ "$os_type" = "Linux" ]; then
-            case "$package_manager" in
-            "apt")
-                sudo apt-get update
-                sudo apt-get install -y unzip
-                ;;
-            "dnf")
-                sudo dnf install -y unzip
-                ;;
-            "pacman")
-                sudo pacman -Sy --noconfirm unzip
-                ;;
-            "apk")
-                sudo apk add --no-cache unzip
-                ;;
-            esac
-        fi
-
-        mise use -g -y elixir@$elixir_version
-        ;;
-    "Erlang")
-        if [ "$os_type" = "macOS" ]; then
-            brew install autoconf openssl@1.1 wxwidgets libxslt fop
-
-            if [ ! -f ~/.kerlrc ]; then
-                printf "KERL_CONFIGURE_OPTIONS=\"--with-ssl=$(brew --prefix openssl@1.1) --without-javac\"\n" >~/.kerlrc
-            fi
-
-            ulimit -n 1024
-        else
-            case "$package_manager" in
-            "apt")
-                sudo apt-get update
-                sudo apt-get install -y build-essential automake autoconf libssl-dev libncurses5-dev
-                ;;
-            "dnf")
-                sudo dnf groupinstall -y "Development Tools"
-                sudo dnf install -y openssl-devel ncurses-devel
-                ;;
-            "pacman")
-                sudo pacman -Sy --noconfirm base-devel openssl ncurses
-                ;;
-            "apk")
-                sudo apk add --no-cache build-base autoconf openssl-dev ncurses-dev
-                ;;
-            esac
-
-            if [ ! -f ~/.kerlrc ]; then
-                printf "KERL_CONFIGURE_OPTIONS=\"--without-javac\"\n" >~/.kerlrc
-            fi
-        fi
-        mise use -g -y erlang@$erlang_version
-
-        ;;
-    "git")
-        if [ "$os_type" = "Linux" ]; then
-            case "$package_manager" in
-            "apt")
-                sudo apt-get update
-                sudo apt-get install -y git
-                ;;
-            "dnf")
-                sudo dnf install -y git
-                ;;
-            "pacman")
-                sudo pacman -Sy --noconfirm git
-                ;;
-            "apk")
-                sudo apk add --no-cache git
-                ;;
-            esac
-        fi
-        ;;
-    "Homebrew")
-        NONINTERACTIVE=1 /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
-        UNAME_MACHINE="$(/usr/bin/uname -m)"
-
-        if [[ "${UNAME_MACHINE}" == "arm64" ]]; then
-            if [ "$current_shell" = "fish" ]; then
-                fish_add_path /opt/homebrew/bin
-            else
-                (
-                    echo
-                    echo 'eval "$(/opt/homebrew/bin/brew shellenv)"'
-                ) >>$config_file
-            fi
-            eval "$(/opt/homebrew/bin/brew shellenv)"
-        else
-            if [ "$current_shell" = "fish" ]; then
-                fish_add_path /usr/local/bin
-            else
-                (
-                    echo
-                    echo 'eval "$(/usr/local/bin/brew shellenv)"'
-                ) >>$config_file
-            fi
-            eval "$(/usr/local/bin/brew shellenv)"
-        fi
-        ;;
-    "mise")
-        curl https://mise.run | sh
-
-        case $current_shell in
-        "bash")
-            echo 'eval "$(~/.local/bin/mise activate bash)"' >>$config_file
-            ;;
-        "fish")
-            echo '~/.local/bin/mise activate fish | source' >>$config_file
-            ;;
-        "zsh")
-            echo 'eval "$(~/.local/bin/mise activate zsh)"' >>$config_file
-            ;;
-        esac
-
-        export PATH="$HOME/.local/bin:$PATH"
-        ;;
-    "Phoenix")
-        mise exec -- mix local.hex --force
-        mise exec -- mix local.rebar --force
-        mise exec -- mix archive.install --force hex phx_new $phoenix_version
-        ;;
-    "PostgreSQL")
-        if [ "$os_type" = "macOS" ]; then
-            brew install gcc readline zlib curl ossp-uuid
-        else
-            case "$package_manager" in
-            "apt")
-                sudo apt-get update
-                sudo apt-get install -y linux-headers-generic build-essential libssl-dev libreadline-dev zlib1g-dev libcurl4-openssl-dev uuid-dev icu-devtools
-                ;;
-            "dnf")
-                sudo dnf groupinstall -y "Development Tools"
-                sudo dnf install -y kernel-headers openssl-devel readline-devel zlib-devel libcurl-devel libuuid-devel libicu-devel
-                ;;
-            "pacman")
-                sudo pacman -Sy --noconfirm linux-headers base-devel openssl readline zlib curl util-linux icu
-                ;;
-            "apk")
-                sudo apk add --no-cache linux-headers build-base openssl-dev readline-dev zlib-dev curl-dev util-linux-dev icu-dev
-                ;;
-            esac
-        fi
-        mise use -g -y postgres@$postgres_version
-        ;;
-    "Xcode Command Line Tools")
-        xcode-select --install
-        ;;
+    Homebrew | Erlang)
+      printf "Installing %s... (this might take a while)\n" "$1"
+      ;;
     *)
-        printf "Invalid name argument on install: %s\n" "$1"
-        exit 1
-        ;;
+      printf "Installing %s...\n" "$1"
+      ;;
     esac
+
+    install "$1"
+  fi
 }
 
-maybe_install() {
-    if already_installed "$1"; then
-        printf "%s is already installed. Skipping...\n" "$1"
-    else
-        printf "Installing %s...\n" "$1"
+install_shell_scripts() {
+  mkdir -p "$phx_tools_path"
+
+  local_bin=\"\$HOME\"/.local/bin
+
+  cat >"$phx_tools_sh_path" <<SH
+#!/bin/sh
+
+# This file is managed by phx.tools and should not be edited by hand.
+SH
+
+  if [ -n "$homebrew_path" ]; then
+    cat >>"$phx_tools_sh_path" <<SH
+
+eval "\$("$homebrew_path"/brew shellenv)"
+SH
+  fi
+
+  cat >>"$phx_tools_sh_path" <<SH
+
+if ! command -v mise >/dev/null 2>/dev/null && [ -x $local_bin/mise ]; then
+  export PATH="$local_bin:\$PATH"
+fi
+
+eval "\$(mise activate "\$(basename \$SHELL)")"
+SH
+
+  cat >"$phx_tools_fish_path" <<FISH
+# This file is managed by phx.tools and should not be edited by hand.
+FISH
+
+  if [ -n "$homebrew_path" ]; then
+    cat >>"$phx_tools_fish_path" <<FISH
+
+$homebrew_path/brew shellenv | source
+FISH
+  fi
+
+  cat >>"$phx_tools_fish_path" <<FISH
+
+if ! command -sq mise && test -x $local_bin/mise
+  fish_add_path --global --path --move $local_bin
+end
 
-        if [ "$1" = "Homebrew" ] || [ "$1" = "Erlang" ]; then
-            printf "This might take a while.\n"
-        fi
+if ! functions -q __mise_env_eval && status is-interactive
+  mise activate fish | source
+end
+FISH
 
-        printf "\n"
-        install "$1"
+  sh_source_line="source '$phx_tools_sh_path'"
+
+  if has bash && [ -f "$HOME"/.bashrc ]; then
+    if ! grep -q "$sh_source_line" "$HOME"/.bashrc; then
+      printf "bash: updating %s/.bashrc to source %s\n" "$HOME" \
+        "$phx_tools_sh_path"
+      printf "\n%s\n" "$sh_source_line" >>"$HOME"/.bashrc
     fi
-}
+  fi
 
-add_env() {
-    printf "\n"
-
-    # Ask for sudo password upfront
-    sudo -v
-
-    # Keep sudo alive
-    while true; do
-        sudo -n true
-        sleep 60
-        kill -0 "$$" || exit
-    done 2>/dev/null &
-
-    if [ "$os_type" = "macOS" ]; then
-        printf "${white}\n"
-        sleep 1.5
-        maybe_install "Xcode Command Line Tools"
-
-        printf "${white}\n"
-        sleep 1.5
-        maybe_install "Homebrew"
-    else
-        printf "${white}\n"
-        sleep 1.5
-        maybe_install "git"
+  if has zsh && [ -f "$HOME"/.zshrc ]; then
+    if ! grep -q "$sh_source_line" "$HOME"/.zshrc; then
+      printf "zsh: updating %s/.zshrc to source %s\n" "$HOME" \
+        "$phx_tools_sh_path"
+      printf "\n%s\n" "$sh_source_line" >>"$HOME"/.zshrc
     fi
+  fi
+
+  if has fish; then
+    fish_confd="$HOME/.config/fish/conf.d"
+    mkdir -p "$fish_confd"
 
-    printf "${white}\n"
-    sleep 1.5
-    maybe_install "mise"
+    fish_confd="$fish_confd/$(basename "$phx_tools_fish_path")"
 
-    printf "${white}\n"
-    sleep 1.5
-    maybe_install "Erlang"
+    printf "fish: linking %s to %s\n" "$phx_tools_fish_path" "$fish_confd"
+    ln -sf "$phx_tools_fish_path" "$fish_confd"
+  fi
+}
 
-    printf "${white}\n"
-    sleep 1.5
-    maybe_install "Elixir"
+add_env() {
+  # Ask for sudo password upfront
+  cat <<SUDO
+phx.tools may need to install build dependencies with your platform package
+manager. We are requesting 'sudo' permission before starting for a smoother
+install.
+
+SUDO
+  sudo -v
+
+  # Keep sudo alive
+  while true; do
+    sudo -n true
+    sleep 60
+    kill -0 "$$" || exit
+  done 2>/dev/null &
+
+  if [ "$os_type" = macOS ]; then
+    maybe_install "Xcode Command Line Tools"
+    maybe_install Homebrew
+  else
+    maybe_install git
+  fi
 
-    printf "${white}\n"
-    sleep 1.5
-    maybe_install "Phoenix"
+  maybe_install "mise"
+  maybe_install "Erlang"
+  maybe_install "Elixir"
+  maybe_install "Phoenix"
+  maybe_install "PostgreSQL"
 
-    printf "${white}\n"
-    sleep 1.5
-    maybe_install "PostgreSQL"
+  install_shell_scripts
 
-    printf "${white}\n"
-    printf "${cyan}${bold}phx.tools setup is complete!\n"
-    printf "${cyan}${bold}Please restart the terminal and type in the following command:\n"
-    printf "${cyan}${bold}mix phx.new\n"
-    printf "${white}\n"
+  printf "\n%sphx.tools setup is complete!\n\n" "$normal$cyan$bold"
+  printf "%sPlease restart the terminal and type in the following command:\n" \
+    "$cyan$bold"
+  printf "%s    mix phx.new\n%s\n" "$cyan$bold" "$normal"
 }
 
-phx_tools="
+banner='
         ██████╗░██╗░░██╗██╗░░██╗  ████████╗░█████╗░░█████╗░██╗░░░░░░██████╗ 
         ██╔══██╗██║░░██║╚██╗██╔╝  ╚══██╔══╝██╔══██╗██╔══██╗██║░░░░░██╔════╝ 
         ██████╔╝███████║░╚███╔╝░  ░░░██║░░░██║░░██║██║░░██║██║░░░░░╚█████╗░ 
         ██╔═══╝░██╔══██║░██╔██╗░  ░░░██║░░░██║░░██║██║░░██║██║░░░░░░╚═══██╗ 
         ██║░░░░░██║░░██║██╔╝╚██╗  ░░░██║░░░╚█████╔╝╚█████╔╝███████╗██████╔╝ 
         ╚═╝░░░░░╚═╝░░╚═╝╚═╝░░╚═╝  ░░░╚═╝░░░░╚════╝░░╚════╝░╚══════╝╚═════╝░ 
-"
-by="
+
                             ██████╗░██╗░░░██╗
                             ██╔══██╗╚██╗░██╔╝
                             ██████╦╝░╚████╔╝░
                             ██╔══██╗░░╚██╔╝░░
                             ██████╦╝░░░██║░░░
                             ╚═════╝░░░░╚═╝░░░
-"
-optimum="
+
     ░█████╗░██████╗░████████╗██╗███╗░░░███╗██╗░░░██╗███╗░░░███╗██████╗░██╗░░██╗
     ██╔══██╗██╔══██╗╚══██╔══╝██║████╗░████║██║░░░██║████╗░████║██╔══██╗██║░░██║
     ██║░░██║██████╔╝░░░██║░░░██║██╔████╔██║██║░░░██║██╔████╔██║██████╦╝███████║
     ██║░░██║██╔═══╝░░░░██║░░░██║██║╚██╔╝██║██║░░░██║██║╚██╔╝██║██╔══██╗██╔══██║
     ╚█████╔╝██║░░░░░░░░██║░░░██║██║░╚═╝░██║╚██████╔╝██║░╚═╝░██║██████╦╝██║░░██║
     ░╚════╝░╚═╝░░░░░░░░╚═╝░░░╚═╝╚═╝░░░░░╚═╝░╚═════╝░╚═╝░░░░░╚═╝╚═════╝░╚═╝░░╚═╝
-"
-
-printf "%s\n" "$phx_tools"
-printf "%s\n" "$by"
-printf "%s\n" "$optimum"
-
-sleep 3
-
-printf "\n"
-
-printf "${bblue}${bold}Welcome to the phx.tools shell script for ${os_type}.\n"
+'
 
-sleep 3
+printf "%s\n" "$bblue$banner"
 
-printf "\n"
+printf "\n%sWelcome to the phx.tools shell script for %s.\n" \
+  "$bblue$bold" "$os_type"
 
-printf "${bblue}${bold}The following will be installed if not available already:\n"
+printf "\n%sThe following will be installed if not available already:\n" \
+  "$bblue$bold"
 
-printf "${cyan}${bold}\n"
+printf "%s\n" "$cyan$bold"
 
-if [ "$os_type" = "macOS" ]; then
-    printf "1) Build dependencies\n"
-    printf "2) Homebrew\n"
-    printf "3) mise\n"
-    printf "4) Erlang\n"
-    printf "5) Elixir\n"
-    printf "6) Phoenix\n"
-    printf "7) PostgreSQL\n"
+if [ "$os_type" = macOS ]; then
+  printf "1) Build dependencies\n"
+  printf "2) Homebrew\n"
+  printf "3) mise\n"
+  printf "4) Erlang\n"
+  printf "5) Elixir\n"
+  printf "6) Phoenix\n"
+  printf "7) PostgreSQL\n"
 else
-    printf "1) Build dependencies\n"
-    printf "2) mise\n"
-    printf "3) Erlang\n"
-    printf "4) Elixir\n"
-    printf "5) Phoenix\n"
-    printf "6) PostgreSQL\n"
+  printf "1) Build dependencies\n"
+  printf "2) mise\n"
+  printf "3) Erlang\n"
+  printf "4) Elixir\n"
+  printf "5) Phoenix\n"
+  printf "6) PostgreSQL\n"
 fi
 
-printf "\n"
-printf "${white}${bold}\n"
-
-sleep 1
-
 is_yn() {
-    case "$1" in
-    [yY] | [yY][eE][sS])
-        true
-        ;;
-    [nN] | [nN][oO])
-        true
-        ;;
-    *)
-        false
-        ;;
-    esac
+  case "$1" in
+  [yY] | [yY][eE][sS])
+    true
+    ;;
+  [nN] | [nN][oO])
+    true
+    ;;
+  *)
+    false
+    ;;
+  esac
 }
 
+printf "\n"
+
 answer=''
 
 while ! is_yn "$answer"; do
-    printf "Do you want to continue? (y/n) "
-    read -r answer
-    printf "\n"
-    case "$answer" in
-    [yY] | [yY][eE][sS])
-        printf "\n"
-        sleep 3
-        add_env
-        ;;
-    [nN] | [nN][oO])
-        printf "Thank you for your time\n"
-        printf "\n"
-        ;;
-    *)
-        printf "Please enter y or n\n"
-        printf "\n"
-        ;;
-    esac
+  printf "%sDo you want to continue? (y/n) %s" "$normal$bold" "$normal"
+  read -r answer
+
+  case "$answer" in
+  [yY] | [yY][eE][sS])
+    break
+    ;;
+  [nN] | [nN][oO])
+    printf "Thank you for your time\n\n"
+    exit 0
+    ;;
+  *)
+    printf >&2 "Please enter y or n\n\n"
+    continue
+    ;;
+  esac
 done
+
+printf "\n"
+add_env