如何编写入门脚本来启动我的后端和前端？

Question

I running python flask as my backend and react as my frontend. Every time I start my app, I have to run export FLASK_APP=app and then flask start in terminal 1 and npm start in terminal 2. How do I write a single script that starts both processes? Here is my attempt:

#!/bin/bash
export FLASK_APP=microblog.py
flask run > /dev/null
npm start --prefix ~/app

Answer 1

Try this:

#!/bin/bash
export FLASK_APP=microblog.py
flask run > /dev/null & pids=$!
npm start --prefix ~/app & pids+=" $!"

trap "kill $pids" SIGTERM SIGINT
wait $pids

This script starts both flask and npm in background, and stores their PIDs. After that, we set up a trap - in case you hit CTRL - C , both programs will get killed. The wait line will block until both the flask and npm process has finished - so you can easily terminate both with CTRL-C .