diff --git a/sh/list.sh b/sh/list.sh
new file mode 100644
index 0000000..478e606
--- /dev/null
+++ b/sh/list.sh
@@ -0,0 +1,26 @@
+# list
+
+RWX_LIST_SEP="$(printf "\037")"
+RWX_LIST_SEP="⋅"
+
+rwx_list_add() {
+	local name="${1}"
+	shift
+	local eval item text
+	eval="printf \"\${${name}}\""
+	text="$(eval "${eval}")"
+	for item; do
+		[ -n "${text}" ] &&
+			text="${text}${RWX_LIST_SEP}"
+		text="${text}${item}"
+	done
+	eval="${name}=\"${text}\""
+	eval "${eval}"
+}
+
+rwx_list_test() {
+	local list
+	rwx_list_add list "a" "b" "c"
+	rwx_list_add list "x" "y" "z"
+	echo "${list}"
+}