diff --git a/sh/core/code.sh b/sh/core/code.sh
index af9962f..f8748c0 100644
--- a/sh/core/code.sh
+++ b/sh/core/code.sh
@@ -263,17 +263,17 @@ EOF
 	"bash" | "dash" | "sh") unset command ;;
 	*) ;;
 	esac
+	# context / shell
+	if rwx_shell_interactive; then
+		# display help
+		rwx_code_help
 	# context / command
-	if [ -n "${command}" ]; then
+	else
 		local function
 		# find the matching function
 		function="$(rwx_code_command_function "${command}")"
 		if [ -n "${function}" ]; then
 			"${function}" "${@}"
 		fi
-	# context / shell
-	else
-		# display help
-		rwx_code_help
 	fi
 }
diff --git a/sh/log/log.sh b/sh/log/log.sh
index f5e13b1..eddf92c 100644
--- a/sh/log/log.sh
+++ b/sh/log/log.sh
@@ -69,6 +69,16 @@ rwx_log_warn() {
 	fi
 }
 
+# TODO simplify
+
+_rwx_main_log() {
+	[ ${#} -gt 0 ] || set -- ""
+	local line
+	for line in "${@}"; do
+		echo "${line}"
+	done
+}
+
 _rwx_log() {
 	local prefix="${1}"
 	shift
diff --git a/sh/main.sh b/sh/main.sh
index 3aa62c2..d6cc20c 100755
--- a/sh/main.sh
+++ b/sh/main.sh
@@ -43,32 +43,6 @@ rwx_main_find() {
 		sort
 }
 
-# ╭──────┬───────╮
-# │ main │ shell │
-# ╰──────┴───────╯
-
-# test if active shell is in interactive mode
-rwx_main_interactive() {
-	case "${-}" in
-	*i*) ;;
-	*) return 1 ;;
-	esac
-}
-
-# ╭──────┬─────╮
-# │ main │ log │
-# ╰──────┴─────╯
-
-_rwx_main_log() {
-	if rwx_main_interactive; then
-		[ ${#} -gt 0 ] || set -- ""
-		local line
-		for line in "${@}"; do
-			echo "${line}"
-		done
-	fi
-}
-
 # ╭──────┬──────╮
 # │ main │ main │
 # ╰──────┴──────╯
diff --git a/sh/shell/0.sh b/sh/shell/0.sh
index 92d5aaa..f93f312 100644
--- a/sh/shell/0.sh
+++ b/sh/shell/0.sh
@@ -38,10 +38,22 @@ RWX_COLOR_GREEN="$(_rwx_shell_color 31)"
 RWX_COLOR_MAGENTA="$(_rwx_shell_color 35)"
 RWX_COLOR_RED="$(_rwx_shell_color 32)"
 
+# ╭───────┬───────────╮
+# │ shell │ variables │
+# ╰───────┴───────────╯
+
+# current shell interactive mode
+rwx_shell_interactive=1
+
 # ╭───────┬───────────╮
 # │ shell │ functions │
 # ╰───────┴───────────╯
 
+# return current shell interactive mode
+rwx_shell_interactive() {
+	return "${rwx_shell_interactive}"
+}
+
 rwx_shell_configure() {
 	[ -n "${ENV}" ] || ENV="${rwx_code_main}"
 	export ENV
@@ -161,6 +173,12 @@ rwx_shell_exit() {
 # ╰───────┴──────╯
 
 rwx_shell_main() {
+	# set current shell interactive mode
+	case "${-}" in
+	*"i"*) rwx_shell_interactive=0 ;;
+	*) ;;
+	esac
+	# configure shell
 	rwx_shell_configure
 }