我的.sh脚本语法错误：文件意外结束

Question

运行.sh脚本时，出现语法错误：文件意外结束

#!/usr/bin/env bash
# Make sure the port is not already bound
if ss -lnt | grep -q :"$SERVER_PORT"; then
  echo "Another process is already listening to port $SERVER_PORT"
  exit 1;
fi

RETRY_INTERVAL=${RETRY_INTERVAL:-0.2}

if ! systemctl is-active --quiet elasticsearch.service; then
  sudo systemctl start elasticsearch.service
  # Wait until Elasticsearch is ready to respond
  until curl --silent "$ELASTICSEARCH_HOSTNAME":"$ELASTICSEARCH_PORT" -w "" -o /dev/null; do
    sleep "$RETRY_INTERVAL"
  done
fi

# Run our API server as a background process
npm run serve &

until ss -lnt | grep -q :"$SERVER_PORT"; do
  sleep "$RETRY_INTERVAL"
done

npx cucumber-js spec/cucumber/features --require-module @babel/register --require spec/cucumber/steps

kill -15 0

我运行脚本时的实际结果是语法错误：文件意外结束