find the pid for a port linux 1

find the pid for a port linux

lsof -i tcp:3000

Here is what the above code is Doing:
1. We’re importing the Flask class from the flask module.
2. We’re creating an instance of the Flask class. The first argument is the name of the application’s module or package. If you are using a single module (as in this example), you should use __name__ because depending on if it’s started as application or imported as module the name will be different (‘__main__’ versus the actual import name). This is needed so that Flask knows where to look for templates, static files, and so on. For more information have a look at the Flask documentation.
3. We then use the route() decorator to tell Flask what URL should trigger our function.
4. The function is given a name which is also used to generate URLs for that particular function, and returns the message we want to display in the user’s browser.
5. Finally we use the run() function to run the local server with our application.

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