How to Keep Your Python Scripts Running on Raspberry Pi When You're Not Logged In

Learn how to use `nohup` and other techniques to run Python scripts on your Raspberry Pi even after disconnecting your SSH session.
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How to Keep Your Python Scripts Running on Raspberry Pi When You're Not Logged In: A Complete Guide

If you’re a Raspberry Pi enthusiast and have written some simple Python scripts, you might have encountered a common problem: your scripts stop running as soon as you disconnect from your SSH session. This can be frustrating, especially when you want to run your scripts unattended. In this guide, we will explore how to keep your scripts running even after you've logged out.

The Problem

You have a Raspberry Pi 3B+ running Ubuntu 22.04 LTS, and you can successfully log in via SSH and execute your script using the following commands:

[[See Video to Reveal this Text or Code Snippet]]

However, once you disconnect, your script terminates as well. This is due to the SSH session sending a hang-up (HUP) signal to the processes started under that session.

The Solution

The solution to this problem lies in using the nohup command, which allows your processes to run immune to hang-up signals. Let's break down the various methods you can use.

Method 1: Single Shot Command

You can run your command in a "single shot," where you type everything in one go. This method is simple and quick:

[[See Video to Reveal this Text or Code Snippet]]

Explanation:

SOMEHOST: Your Raspberry Pi's address.

SOMEWHERE: The directory where your script is located.

The & at the end allows the process to run in the background.

Method 2: Multi-Step Session

Alternatively, you can log in, navigate to the correct directory, and run your commands, allowing you to return a prompt for additional commands before eventually logging out:

[[See Video to Reveal this Text or Code Snippet]]

Steps:

Log in to your Raspberry Pi.

Navigate to your script's directory.

Start your script with nohup.

Exit the SSH session.

Method 3: Here Document

Another "single shot" approach is using a Here Document, which allows you to send multiple commands at once without waiting for a prompt:

[[See Video to Reveal this Text or Code Snippet]]

Advantages:

You do not need to wait for each command to finish before sending the next.

Once complete, control is returned, and you can log out.

Conclusion

Using nohup is an effective way to run your Python scripts on a Raspberry Pi without interruption, even after disconnecting from your SSH session. Choose the method that best fits your workflow, whether it's a quick one-liner or a more extensive set of commands.

Now, with these techniques at your disposal, you can leave your scripts running without the fear of them being interrupted by your absence. Happy coding!