Getting your script to execute when you boot up your Raspberry Pi can be very useful. For example, connecting your Raspberry pi to your Synergy server automatically when it turns on so you don’t need to plug in a keyboard just to execute the “startsynergy” command.
We will focus our setup around the Raspbian OS. Even though the setup is different between the Raspbian GUI OS and the Headless OS (Raspbian Lite), the processes is still fairly straight forward. This guide will demonstrate how to do it on both Operating Systems.
Raspbian Lite (Headless OS)
I will start off with the easiest of the lot. As you boot up into a terminal in an headless environment, we can use the .bashrc file of the user you are logging in as.
First ensure that the file exists (it should by default… but just encase…)
> sudo touch ~/.bashrc
This will create (if not already created) a .bashrc file within the currently logged in users home directory. Next we want to edit this file using the Nano Text Editor:
> sudo nano ~/.bashrc
With our .bashrc file open, scroll all the way to the bottom of the file using your keyboards arrow keys. On the last line of the file (but before any exit statements) type the script you want to execute in the exact same way as you would in the terminal. For example, if I wanted to execute a python script, I enter the following
Notice how I am using an absolute path to the file (~/ is a shortcut to the home directory of the logged in user). It is best to stick to absolute paths for this kind of stuff.
When you’re done, press “CTRL + X” to exit and “Y” to confirm changes. Reboot your Pi and you should see your script execute!
Caveat: One thing to note is, this script will run every time you open up a terminal. So if you log into your Pi via SSH from your main PC, this script will run again. If you have a long running script, you can press “CTRL + C” to break out of it early.
Executing a script on startup with the Raspbian GUI is slightly different. The script has to be executed when the desktop environment loads. We can edit the file which runs when this event occurs by opening it with Nano:
> sudo nano /etc/xdg/lxsession/LXDE/autostart
Like our .bashrc file, we must add our script to the end of this file (but again ensuring we put it before any exit statements). For this example, I will use our startsynergy script we created some posts ago. It is launched via bash, so the line would look as follows:
Upon restarting the Pi, and providing you have your Synergy Server running, your Pi should now auto connect to your Synergy Server without the need for manual intervention.
Likewise, if you want to execute python scripts, for example, you can do so in the following manner:
To save the file hit “CTRL + X” and “Y” to confirm changes. Upon rebooting your Pi and logging into the desktop, you should notice that your script executes.