diff --git a/sh/core/code.sh b/sh/core/code.sh
index 3d65f5c..af9962f 100644
--- a/sh/core/code.sh
+++ b/sh/core/code.sh
@@ -6,16 +6,15 @@
 # │ code │ variables │
 # ╰──────┴───────────╯
 
-# TODO variablize
 # path to the entrypoint main file of the project
-RWX_MAIN_PATH="${RWX_ROOT_SYSTEM}/${RWX_MAIN_NAME}.${RWX_MAIN_EXTENSION}"
+rwx_code_main="${rwx_main_root}/${RWX_MAIN_MODULE}.${RWX_MAIN_EXTENSION}"
 # user root directory of the project
-RWX_SELF_USER="${HOME}/${RWX_SELF_NAME}"
+rwx_code_root="${HOME}/${RWX_MAIN_NAME}"
 
 # cache of all sourced code modules
 _rwx_code=""
 # cache for the parsing awk script
-_rwx_code_awk="$(cat "${RWX_ROOT_SYSTEM}/core/code.awk")"
+_rwx_code_awk="$(cat "${rwx_main_root}/core/code.awk")"
 # cache for code aliases
 _rwx_code_aliases=""
 # cache for code aliases functions
@@ -55,16 +54,16 @@ rwx_code_install() {
 	local command file name root
 	# code
 	if [ -n "${target}" ]; then
-		root="${target}${RWX_ROOT_SYSTEM}"
+		root="${target}${rwx_main_root}"
 		rwx_remove "${root}"
-		cp --recursive "${RWX_ROOT_SYSTEM}" "${root}"
+		cp --recursive "${rwx_main_root}" "${root}"
 	fi
 	# commands
 	root="${target}/usr/local/bin"
-	name="${RWX_SELF_NAME}.${RWX_MAIN_EXTENSION}"
+	name="${RWX_MAIN_NAME}.${RWX_MAIN_EXTENSION}"
 	file="${root}/${name}"
 	rwx_remove "${file}"
-	rwx_link "${file}" "${RWX_MAIN_PATH}"
+	rwx_link "${file}" "${rwx_code_main}"
 	while IFS= read -r command; do
 		file="${root}/${command}"
 		rwx_remove "${file}"
@@ -73,15 +72,15 @@ rwx_code_install() {
 ${_rwx_code_commands}
 EOF
 	# sh
-	file="${target}/etc/profile.d/${RWX_SELF_NAME}.${RWX_MAIN_EXTENSION}"
+	file="${target}/etc/profile.d/${RWX_MAIN_NAME}.${RWX_MAIN_EXTENSION}"
 	rwx_remove "${file}"
 	rwx_file_write "${file}" "\
-export ENV=\"${RWX_MAIN_PATH}\"
+export ENV=\"${rwx_code_main}\"
 "
 	# bash
 	file="${target}/etc/bash.bashrc"
 	rwx_remove "${file}"
-	rwx_link "${file}" "${RWX_MAIN_PATH}"
+	rwx_link "${file}" "${rwx_code_main}"
 }
 
 # ╭──────┬───────╮
@@ -164,10 +163,10 @@ rwx_code_variables() {
 rwx_code_check() {
 	# check format
 	rwx_log
-	rwx_shfmt "${RWX_ROOT_SYSTEM}"
+	rwx_shfmt "${rwx_main_root}"
 	# check syntax
 	rwx_log
-	rwx_shellcheck "${RWX_ROOT_SYSTEM}"
+	rwx_shellcheck "${rwx_main_root}"
 }
 
 # fetch matching doc for given name
@@ -228,10 +227,10 @@ rwx_code_main() {
 	local modules_main="${1}"
 	local module modules_user
 	# find & source modules
-	modules_user="$(rwx_main_find "${RWX_SELF_USER}")"
+	modules_user="$(rwx_main_find "${rwx_code_root}")"
 	while IFS= read -r module; do
 		# shellcheck disable=SC1090
-		. "${RWX_SELF_USER}/${module}.${RWX_MAIN_EXTENSION}"
+		. "${rwx_code_root}/${module}.${RWX_MAIN_EXTENSION}"
 	done <<EOF
 ${modules_user}
 EOF
@@ -239,7 +238,7 @@ EOF
 	while IFS= read -r module; do
 		# cache main module
 		_rwx_code="${_rwx_code}#. ${module}
-$(cat "${RWX_ROOT_SYSTEM}/${module}.${RWX_MAIN_EXTENSION}")
+$(cat "${rwx_main_root}/${module}.${RWX_MAIN_EXTENSION}")
 "
 	done <<EOF
 ${modules_main}
@@ -248,7 +247,7 @@ EOF
 	while IFS= read -r module; do
 		# cache module
 		_rwx_code="${_rwx_code}#. ${module}
-$(cat "${RWX_SELF_USER}/${module}.${RWX_MAIN_EXTENSION}")
+$(cat "${rwx_code_root}/${module}.${RWX_MAIN_EXTENSION}")
 "
 	done <<EOF
 ${modules_user}
diff --git a/sh/main.sh b/sh/main.sh
index 6a3a3d3..3aa62c2 100755
--- a/sh/main.sh
+++ b/sh/main.sh
@@ -8,21 +8,21 @@
 # │ main │ constants │
 # ╰──────┴───────────╯
 
+# parent directory for the project
+RWX_MAIN_PARENT="/usr/local/lib"
+# name of the project itself
+RWX_MAIN_NAME="rwx"
+# name of the entrypoint module
+RWX_MAIN_MODULE="main"
 # extension of shell modules
 RWX_MAIN_EXTENSION="sh"
 
-# name of the entrypoint module
-RWX_MAIN_NAME="main"
-# name of the project itself
-RWX_SELF_NAME="rwx"
-
 # ╭──────┬───────────╮
 # │ main │ variables │
 # ╰──────┴───────────╯
 
-# TODO variablize
 # system root directory of the project
-RWX_ROOT_SYSTEM="/usr/local/lib/${RWX_SELF_NAME}"
+rwx_main_root="${RWX_MAIN_PARENT}/${RWX_MAIN_NAME}"
 
 # ╭──────┬──────╮
 # │ main │ find │
@@ -78,11 +78,11 @@ _rwx_main_log() {
 rwx_main_main() {
 	local module modules
 	# find & source modules
-	modules="$(rwx_main_find "${RWX_ROOT_SYSTEM}")"
+	modules="$(rwx_main_find "${rwx_main_root}")"
 	while IFS= read -r module; do
-		if [ "${module}" != "${RWX_MAIN_NAME}" ]; then
+		if [ "${module}" != "${RWX_MAIN_MODULE}" ]; then
 			# shellcheck disable=SC1090
-			. "${RWX_ROOT_SYSTEM}/${module}.${RWX_MAIN_EXTENSION}"
+			. "${rwx_main_root}/${module}.${RWX_MAIN_EXTENSION}"
 		fi
 	done <<EOF
 ${modules}
diff --git a/sh/self.sh b/sh/self.sh
index fc62d88..d399c0d 100644
--- a/sh/self.sh
+++ b/sh/self.sh
@@ -10,14 +10,14 @@
 rwx_self_subset() {
 	local argument file root
 	for argument in "${@}"; do
-		root="${RWX_ROOT_SYSTEM}/${argument}"
+		root="${rwx_main_root}/${argument}"
 		file="${argument}.${RWX_MAIN_EXTENSION}"
 		if [ -d "${root}" ]; then
 			local file
 			for file in $(rwx_main_find "${root}"); do
 				echo "${argument}/${file}.${RWX_MAIN_EXTENSION}"
 			done
-		elif [ -f "${RWX_ROOT_SYSTEM}/${file}" ]; then
+		elif [ -f "${rwx_main_root}/${file}" ]; then
 			echo "${file}"
 		fi
 	done
@@ -38,7 +38,7 @@ rwx_self_write() {
 		files="$(rwx_self_subset "${@}")"
 		while IFS= read -r file; do
 			text="${text}
-$(cat "${RWX_ROOT_SYSTEM}/${file}")
+$(cat "${rwx_main_root}/${file}")
 "
 		done <<EOF
 ${files}
diff --git a/sh/shell/0.sh b/sh/shell/0.sh
index ed847cb..92d5aaa 100644
--- a/sh/shell/0.sh
+++ b/sh/shell/0.sh
@@ -43,7 +43,7 @@ RWX_COLOR_RED="$(_rwx_shell_color 32)"
 # ╰───────┴───────────╯
 
 rwx_shell_configure() {
-	[ -n "${ENV}" ] || ENV="${RWX_MAIN_PATH}"
+	[ -n "${ENV}" ] || ENV="${rwx_code_main}"
 	export ENV
 	# prompt
 	PS1="\$(rwx_shell_prompt \${?})"
diff --git a/sh/test.sh b/sh/test.sh
index 1b082b5..1ef31ec 100644
--- a/sh/test.sh
+++ b/sh/test.sh
@@ -41,7 +41,7 @@ rwx_test_doc() {
 		"main" \
 		"alias/git" \
 		\
-		"RWX_MAIN_NAME" \
+		"RWX_MAIN_MODULE" \
 		\
 		"_rwx_code" \
 		\