diff --git a/.lib/sh/stubexec.sh b/.lib/sh/stubexec.sh
new file mode 100644
--- /dev/null
+++ b/.lib/sh/stubexec.sh
@@ -0,0 +1,6 @@
+stubexec() {
+  local real_bin="$(which -a $(basename $0) | grep -v $0 | head -n 1)"
+  if [ -x "$real_bin" ]; then
+    exec $real_bin $*
+  fi
+}