-#!/usr/bin/env sh
+#!/bin/sh
+
+set -eu
if [ ! -f "dist/server.js" ]; then
echo "Missing server file (server.js)."
max=${1:-3}
-for i in $(seq 1 $max); do
+for i in $(seq 1 "$max"); do
NODE_ENV=test NODE_APP_INSTANCE=$i node dist/server.js &
sleep 1
done