diff --git a/install.sh b/install.sh
new file mode 100644
index 0000000..fd625ab
--- /dev/null
+++ b/install.sh
@@ -0,0 +1,277 @@
+#!/bin/bash
+#set -ueo pipefail
+#set -x
+
+REPO_DIR=$(cd $(dirname $0) && pwd)
+SRC_DIR=${REPO_DIR}/src
+
+DEST_DIR=/usr/share/themes
+THEME_NAME=Sierra
+COMPACT_VARIANTS=('' '-compact')
+TRANS_VARIANTS=('' '-solid')
+COLOR_VARIANTS=( '-light' '-dark')
+THIN_VARIANTS=( '' '-thin')
+
+
+usage() {
+  printf "%s\n" "Usage: $0 [OPTIONS...]"
+  printf "\n%s\n" "OPTIONS:"
+  printf "  %-25s%s\n" "-d, --dest DIR" "Specify theme destination directory (Default: ${DEST_DIR})"
+  printf "  %-25s%s\n" "-n, --name NAME" "Specify theme name (Default: ${THEME_NAME})"
+  printf "  %-25s%s\n" "-t, --trans VARIANTS..." "Specify theme trans variant(s) [solid] (Default: All variants)"
+  printf "  %-25s%s\n" "-c, --color VARIANTS..." "Specify theme color variant(s) [light|dark] (Default: All variants)"
+  printf "  %-25s%s\n" "-i, --thin VARIANTS..." "Specify theme trans variant(s) [thin] (Default: All variants)"
+  printf "  %-25s%s\n" "-s, --compact VARIANT" "Specify theme compact variant [compact] (Default: All variants)"
+  printf "  %-25s%s\n" "-g, --gdm" "Install GDM theme"
+  printf "  %-25s%s\n" "-h, --help" "Show this help"
+  printf "\n%s\n" "INSTALLATION EXAMPLES:"
+  printf "%s\n" "Install all theme variants into ~/.themes"
+  printf "  %s\n" "$0 --dest ~/.themes"
+  printf "%s\n" "Install all theme variants into ~/.themes including GDM theme"
+  printf "  %s\n" "$0 --dest ~/.themes --gdm"
+  printf "%s\n" "Install standard theme variant only"
+  printf "  %s\n" "$0 --color standard --size standard"
+  printf "%s\n" "Install specific theme variants with different name into ~/.themes"
+  printf "  %s\n" "$0 --dest ~/.themes --name MyTheme --color light dark --size compact"
+}
+
+install() {
+  local dest=${1}
+  local name=${2}
+  local compact=${3}
+  local color=${4}
+  local trans=${5}
+  local thin=${6}
+
+  [[ ${color} == '-light' ]] && local ELSE_LIGHT=${color}
+  [[ ${color} == '-dark' ]] && local ELSE_DARK=${color}
+
+  local THEME_DIR=${dest}/${name}${compact}${color}${trans}${thin}
+
+  [[ -d ${THEME_DIR} ]] && rm -rf ${THEME_DIR}
+
+  echo "Installing '${THEME_DIR}'..."
+
+  mkdir -p                                                                      ${THEME_DIR}
+  cp -r ${REPO_DIR}/COPYING                                                     ${THEME_DIR}
+  # Install index.theme
+	echo "[Desktop Entry]" >>                                                     ${THEME_DIR}/index.theme
+	echo "Type=X-GNOME-Metatheme" >>                                              ${THEME_DIR}/index.theme
+	echo "Name=Sierra${compact}${color}${trans}${thin}" >>                        ${THEME_DIR}/index.theme
+	echo "Comment=An Stylish Gtk+ theme based on Elegant Design" >>               ${THEME_DIR}/index.theme
+	echo "Encoding=UTF-8" >>                                                      ${THEME_DIR}/index.theme
+	echo "" >>                                                                    ${THEME_DIR}/index.theme
+	echo "[X-GNOME-Metatheme]" >>                                                 ${THEME_DIR}/index.theme
+	echo "GtkTheme=Sierra${compact}${color}${trans}${thin}" >>                    ${THEME_DIR}/index.theme
+	echo "MetacityTheme=Sierra${compact}${color}${trans}${thin}" >>               ${THEME_DIR}/index.theme
+	echo "IconTheme=Adwaita" >>                                                   ${THEME_DIR}/index.theme
+	echo "CursorTheme=Adwaita" >>                                                 ${THEME_DIR}/index.theme
+	echo "ButtonLayout=close,minimize,maximize:menu" >>                           ${THEME_DIR}/index.theme
+
+  mkdir -p                                                                      ${THEME_DIR}/gnome-shell
+  cd ${SRC_DIR}/gnome-shell
+  cp -r ${SRC_DIR}/gnome-shell/gnome-shell${color}${trans}.css                  ${THEME_DIR}/gnome-shell/gnome-shell.css
+  cp -r ${SRC_DIR}/gnome-shell/{extensions,message-indicator-symbolic.svg,pad-osd.css} ${THEME_DIR}/gnome-shell
+  cp -r ${SRC_DIR}/gnome-shell/gnome-shell-theme.gresource.xml                  ${THEME_DIR}/gnome-shell
+  mkdir -p                                                                      ${THEME_DIR}/gnome-shell/assets
+  cd ${SRC_DIR}/gnome-shell/assets
+  cp -r ${SRC_DIR}/gnome-shell/assets/{dash,dash-placeholder.svg,noise-texture.svg,startup.png,process-working.svg,window-close.svg,window-close-active.svg,toggle-on.svg,more-results.svg,checkbox.svg,key-enter.svg,key-shift-latched-uppercase.svg,key-shift-uppercase.svg} ${THEME_DIR}/gnome-shell/assets
+  cp -r ${SRC_DIR}/gnome-shell/assets/activities${color}.svg                    ${THEME_DIR}/gnome-shell/assets/activities.svg
+  cp -r ${SRC_DIR}/gnome-shell/assets/no-events${color}.svg                     ${THEME_DIR}/gnome-shell/assets/no-events.svg
+  cp -r ${SRC_DIR}/gnome-shell/assets/no-notifications${color}.svg              ${THEME_DIR}/gnome-shell/assets/no-notifications.svg
+  cp -r ${SRC_DIR}/gnome-shell/assets/calendar-arrow-left${color}.svg           ${THEME_DIR}/gnome-shell/assets/calendar-arrow-left.svg
+  cp -r ${SRC_DIR}/gnome-shell/assets/calendar-arrow-right${color}.svg          ${THEME_DIR}/gnome-shell/assets/calendar-arrow-right.svg
+  cp -r ${SRC_DIR}/gnome-shell/assets/checkbox-off${color}.svg                  ${THEME_DIR}/gnome-shell/assets/checkbox-off.svg
+  cp -r ${SRC_DIR}/gnome-shell/assets/close${color}.svg                         ${THEME_DIR}/gnome-shell/assets/close.svg
+  cp -r ${SRC_DIR}/gnome-shell/assets/toggle-off${color}.svg                    ${THEME_DIR}/gnome-shell/assets/toggle-off.svg
+  cp -r ${SRC_DIR}/gnome-shell/assets/key-hide${color}.svg                      ${THEME_DIR}/gnome-shell/assets/key-hide.svg
+  cp -r ${SRC_DIR}/gnome-shell/assets/key-layout${color}.svg                    ${THEME_DIR}/gnome-shell/assets/key-layout.svg
+  cp -r ${SRC_DIR}/gnome-shell/assets/key-shift${color}.svg                     ${THEME_DIR}/gnome-shell/assets/key-shift.svg
+  cd ${THEME_DIR}/gnome-shell
+  ln -s assets/no-events.svg no-events.svg
+  ln -s assets/process-working.svg process-working.svg
+  ln -s assets/no-notifications.svg no-notifications.svg
+
+  mkdir -p                                                                      ${THEME_DIR}/gtk-2.0
+  cd ${SRC_DIR}/gtk-2.0
+  cp -r ${SRC_DIR}/gtk-2.0/gtkrc${color}                                        ${THEME_DIR}/gtk-2.0/gtkrc
+  cp -r ${SRC_DIR}/gtk-2.0/assets${color}                                       ${THEME_DIR}/gtk-2.0/assets
+  cp -r ${SRC_DIR}/gtk-2.0/{apps.rc,main.rc,panel.rc,xfce-notify.rc}            ${THEME_DIR}/gtk-2.0
+  cp -r ${SRC_DIR}/gtk-2.0/menubar-toolbar${color}.rc                           ${THEME_DIR}/gtk-2.0/menubar-toolbar.rc
+
+  mkdir -p                                                                      ${THEME_DIR}/gtk-3.0
+  cd ${SRC_DIR}/gtk-3.0
+  cp -r ${SRC_DIR}/gtk-3.0/assets                                               ${THEME_DIR}/gtk-3.0
+	cp -r ${SRC_DIR}/gtk-3.0/thumbnail${compact}${color}.png                      ${THEME_DIR}/gtk-3.0/thumbnail.png
+	cp -r ${SRC_DIR}/gtk-3.0/gtk${compact}${color}${trans}${thin}.css             ${THEME_DIR}/gtk-3.0/gtk.css
+	cp -r ${SRC_DIR}/gtk-3.0/gtk${compact}-dark${trans}${thin}.css                ${THEME_DIR}/gtk-3.0/gtk-dark.css
+
+  mkdir -p                                                                      ${THEME_DIR}/metacity-1
+  cd ${SRC_DIR}/metacity-1
+  cp -r ${SRC_DIR}/metacity-1/metacity-theme${color}.xml                        ${THEME_DIR}/metacity-1/metacity-theme.xml
+  cp -r ${SRC_DIR}/metacity-1/{*.png,*.svg}                                     ${THEME_DIR}/metacity-1
+  cd ${THEME_DIR}/metacity-1
+	ln -s metacity-theme.xml metacity-theme-1.xml
+	ln -s metacity-theme.xml metacity-theme-2.xml
+	ln -s metacity-theme.xml metacity-theme-3.xml
+
+  mkdir -p                                                                      ${THEME_DIR}/unity
+  cd ${SRC_DIR}
+  cp -r ${SRC_DIR}/unity                                                        ${THEME_DIR}
+
+  mkdir -p                                                                      ${THEME_DIR}/xfwm4
+  cd ${SRC_DIR}/xfwm4
+  cp -r ${SRC_DIR}/xfwm4/assets${color}/*.png                                   ${THEME_DIR}/xfwm4
+  cp -r ${SRC_DIR}/xfwm4/themerc${color}                                        ${THEME_DIR}/xfwm4/themerc
+}
+install_gdm() {
+    local THEME_DIR=${1}/${2}${3}${4}${5}${6}
+      # bakup and install files related to gdm theme
+      if [[ ! -f /usr/share/gnome-shell/gnome-shell-theme.gresource.bak ]]; then
+          mv -f /usr/share/gnome-shell/gnome-shell-theme.gresource \
+                /usr/share/gnome-shell/gnome-shell-theme.gresource.bak
+      fi
+      if [[ -f /usr/share/gnome-shell/theme/ubuntu.css ]]; then
+          if [[ ! -f /usr/share/gnome-shell/theme/ubuntu.css.bak ]]; then
+              mv -f /usr/share/gnome-shell/theme/ubuntu.css \
+                     /usr/share/gnome-shell/theme/ubuntu.css.bak
+          fi
+          cp -af ${THEME_DIR}/gnome-shell/gnome-shell.css \
+                 /usr/share/gnome-shell/theme/ubuntu.css
+      fi
+      glib-compile-resources \
+       --sourcedir=${THEME_DIR}/gnome-shell \
+       --target=/usr/share/gnome-shell/gnome-shell-theme.gresource \
+       ${THEME_DIR}/gnome-shell/gnome-shell-theme.gresource.xml
+  echo "Installing 'gnome-shell-theme.gresource'..."
+}
+while [[ $# -gt 0 ]]; do
+  case "${1}" in
+    -d|--dest)
+      dest="${2}"
+      if [[ ! -d "${dest}" ]]; then
+        echo "ERROR: Destination directory does not exist."
+        exit 1
+      fi
+      shift 2
+      ;;
+    -n|--name)
+      name="${2}"
+      shift 2
+      ;;
+    -g|--gdm)
+      gdm=true
+      shift 1
+      ;;
+    -t|--trans)
+      shift
+      for variant in "${@}"; do
+        case "${variant}" in
+          solid)
+            transs+=("${TRANS_VARIANTS[1]}")
+            shift
+            ;;
+          -*|--*)
+            break
+            ;;
+          *)
+            echo "ERROR: Unrecognized trans variant '$1'."
+            echo "Try '$0 --help' for more information."
+            exit 1
+            ;;
+        esac
+      done
+      ;;
+    -c|--color)
+      shift
+      for variant in "${@}"; do
+        case "${variant}" in
+          light)
+            colors+=("${COLOR_VARIANTS[1]}")
+            shift
+            ;;
+          dark)
+            colors+=("${COLOR_VARIANTS[2]}")
+            shift
+            ;;
+          -*|--*)
+            break
+            ;;
+          *)
+            echo "ERROR: Unrecognized color variant '$1'."
+            echo "Try '$0 --help' for more information."
+            exit 1
+            ;;
+        esac
+      done
+      ;;
+    -t|--thin)
+      shift
+      for variant in "${@}"; do
+        case "${variant}" in
+          thin)
+            thins+=("${THIN_VARIANTS[1]}")
+            shift
+            ;;
+          -*|--*)
+            break
+            ;;
+          *)
+            echo "ERROR: Unrecognized thin variant '$1'."
+            echo "Try '$0 --help' for more information."
+            exit 1
+            ;;
+        esac
+      done
+      ;;
+    -s|--size)
+      shift
+      for variant in "${@}"; do
+        case "${variant}" in
+          compact)
+            transs+=("${SIZE_VARIANTS[1]}")
+            shift
+            ;;
+          -*|--*)
+            break
+            ;;
+          *)
+            echo "ERROR: Unrecognized size variant '$1'."
+            echo "Try '$0 --help' for more information."
+            exit 1
+            ;;
+        esac
+      done
+      ;;
+    -h|--help)
+      usage
+      exit 0
+      ;;
+    *)
+      echo "ERROR: Unrecognized installation option '$1'."
+      echo "Try '$0 --help' for more information."
+      exit 1
+      ;;
+  esac
+done
+
+if [[ ! -w "${dest:-${DEST_DIR}}" ]]; then
+  echo "Please run as root."
+  exit 1
+fi
+
+for compact in "${compacts[@]:-${COMPACT_VARIANTS[@]}}"; do
+  for trans in "${transs[@]:-${TRANS_VARIANTS[@]}}"; do
+    for color in "${colors[@]:-${COLOR_VARIANTS[@]}}"; do
+      for thin in "${thins[@]:-${THIN_VARIANTS[@]}}"; do
+        install "${dest:-${DEST_DIR}}" "${name:-${THEME_NAME}}" "${compact}" "${color}" "${trans}" "${thin}"
+      done
+    done
+  done
+done
+  if [[ $gdm == true ]]; then
+    install_gdm "${dest:-${DEST_DIR}}" "${name:-${THEME_NAME}}" "${compact}" "${color}" "${trans}" "${thin}"
+  fi
+
+echo
+echo Done.