diff --git a/src/sh/history.sh b/src/sh/history.sh
new file mode 100644
index 0000000..33aeffd
--- /dev/null
+++ b/src/sh/history.sh
@@ -0,0 +1,6 @@
+if [ ! "${HISTORY_LOADED:-}" ]; then
+  export NMFHIST=$(mktemp)
+  touch "$NMFHIST"
+  trap 'rm -f "$NMFHIST"' EXIT INT
+  export HISTORY_LOADED=1
+fi