diff --git a/sh/main.sh b/sh/main.sh
index a7d1781..d6cc20c 100755
--- a/sh/main.sh
+++ b/sh/main.sh
@@ -43,18 +43,6 @@ rwx_main_find() {
 		sort
 }
 
-# ╭──────┬───────╮
-# │ main │ shell │
-# ╰──────┴───────╯
-
-# test if active shell is in interactive mode
-rwx_main_interactive() {
-	case "${-}" in
-	*i*) ;;
-	*) return 1 ;;
-	esac
-}
-
 # ╭──────┬──────╮
 # │ main │ main │
 # ╰──────┴──────╯
diff --git a/sh/shell/0.sh b/sh/shell/0.sh
index 92d5aaa..33a7745 100644
--- a/sh/shell/0.sh
+++ b/sh/shell/0.sh
@@ -38,10 +38,22 @@ RWX_COLOR_GREEN="$(_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=0
+
 # ╭───────┬───────────╮
 # │ 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=1 ;;
+	*) ;;
+	esac
+	# configure shell
 	rwx_shell_configure
 }