diff --git a/sh/alias/shell.sh b/sh/alias/shell.sh
new file mode 100644
index 0000000..d6f5801
--- /dev/null
+++ b/sh/alias/shell.sh
@@ -0,0 +1,29 @@
+# shorten alias
+a() {
+	alias \
+		"${@}"
+}
+
+# swap directory (current ↔ previous)
+sd() {
+	cd \
+		- ||
+		return
+}
+
+# exit terminal
+x() {
+	exit \
+		"${@}"
+}
+
+[ "${RWX_SHELL}" = "bash" ] || return
+
+# shellcheck disable=SC3033
+..() {
+	cd ..
+}
+# shellcheck disable=SC3033
+...() {
+	cd ../..
+}
diff --git a/sh/main.sh b/sh/main.sh
index 16ce907..d96d776 100755
--- a/sh/main.sh
+++ b/sh/main.sh
@@ -26,6 +26,17 @@ RWX_SELF_NAME="rwx"
 # │ main │ variables │
 # ╰──────┴───────────╯
 
+RWX_COMMAND_ARGUMENT="${0}"
+# currently running shell name
+RWX_SHELL="$(cat "/proc/${$}/comm")"
+
+# command name used to run
+# (stripped from hyphen interactive flag)
+RWX_COMMAND_NAME="$(basename "${RWX_COMMAND_ARGUMENT}" | sed "s|^-||")"
+case "${RWX_COMMAND_NAME}" in
+"bash" | "dash" | "sh") unset RWX_COMMAND_NAME ;;
+*) ;;
+esac
 # system root directory of the project
 RWX_ROOT_SYSTEM="/usr/local/lib/${RWX_SELF_NAME}"
 # user root directory of the project
@@ -52,18 +63,9 @@ rwx_main() {
 	# load code cache
 	rwx_code_load
 	# context / command
-	local command
-	# command name used to run
-	# (stripped from hyphen interactive flag)
-	command="$(basename "${0}" | sed "s|^-||")"
-	case "${command}" in
-	"bash" | "dash" | "sh") unset command ;;
-	*) ;;
-	esac
-	if [ -n "${command}" ]; then
+	if [ -n "${RWX_COMMAND_NAME}" ]; then
 		local function
-		# find the matching function
-		function="$(rwx_code_alias_function "${command}")"
+		function="$(rwx_code_alias_function "${RWX_COMMAND_NAME}")"
 		if [ -n "${function}" ]; then
 			"${function}" "${@}"
 		fi
diff --git a/sh/shell.sh b/sh/shell.sh
index 8400fd2..7e56658 100644
--- a/sh/shell.sh
+++ b/sh/shell.sh
@@ -1,7 +1,3 @@
-# ╭───────╮
-# │ shell │
-# ╰───────╯
-
 _rwx_shell_color() {
 	local code="${1}"
 	case "${RWX_SHELL}" in
@@ -23,11 +19,6 @@ _rwx_shell_color() {
 		;;
 	esac
 }
-
-# ╭───────┬───────────╮
-# │ shell │ constants │
-# ╰───────┴───────────╯
-
 RWX_COLOR_BROWN="$(_rwx_shell_color 33)"
 RWX_COLOR_CYAN="$(_rwx_shell_color 36)"
 RWX_COLOR_DEFAULT="$(_rwx_shell_color)"
@@ -35,17 +26,6 @@ RWX_COLOR_GREEN="$(_rwx_shell_color 31)"
 RWX_COLOR_MAGENTA="$(_rwx_shell_color 35)"
 RWX_COLOR_RED="$(_rwx_shell_color 32)"
 
-# ╭───────┬───────────╮
-# │ shell │ variables │
-# ╰───────┴───────────╯
-
-# currently running shell name
-RWX_SHELL="$(cat "/proc/${$}/comm")"
-
-# ╭───────┬───────────╮
-# │ shell │ functions │
-# ╰───────┴───────────╯
-
 rwx_shell_configure() {
 	[ -n "${ENV}" ] || ENV="${RWX_MAIN_PATH}"
 	export ENV
@@ -134,37 +114,3 @@ rwx_shell_prompt() {
 	# print
 	printf "%b" "${view}"
 }
-
-# ╭───────┬───────────╮
-# │ shell │ shortcuts │
-# ╰───────┴───────────╯
-
-# shorten alias
-a() {
-	alias \
-		"${@}"
-}
-
-# swap directory (current ↔ previous)
-sd() {
-	cd \
-		- ||
-		return
-}
-
-# exit terminal
-x() {
-	exit \
-		"${@}"
-}
-
-[ "${RWX_SHELL}" = "bash" ] || return
-
-# shellcheck disable=SC3033
-..() {
-	cd ..
-}
-# shellcheck disable=SC3033
-...() {
-	cd ../..
-}