For some specific use cases it may be very handy to have a script automatically run when the Raspberry Pi boots up. Below I help you set this up.
There are a number of ways to have a command, script or program run when the Raspberry pi boots. This is especially useful if you want to power up your Pi in headless mode (that is without a connected monitor), and have it run a program without configuration or a manual start. I suggest to use the method that uses the
On your Raspberry Pi, edit the file
/etc/rc.local as root:
sudo nano /etc/rc.local
Add your commands below the comment, but leave the line
exit 0 at the end, then save the file and exit. For example, to run your script
myscript.py add the line:
or to run a custom bash schedule script, add the line:
Be sure to reference absolute filenames rather than relative to your home folder, such as
/home/pi/myscript.py rather than
Make sure that the file
rc.local is executable otherwise it will not run:
sudo chmod +x /etc/rc.local
Now reboot your Raspberry Pi to test it:
If you add a script or command to your
/etc/rc.local file, it will be added to the boot sequence. If your code gets stuck then the boot sequence cannot proceed. So be careful as to which code you are trying to run at boot and test the code a couple of times.
Alternatively, and if your script is not instant but runs continuously, you should fork the process by adding an ampersand to the end of the command:
python3 /home/pi/myscript.py &
The ampersand allows the command to run in a separate process and continue booting with the process running.
If you want to simultaneously write a logfile, run the command as follows:
bash -c '/usr/bin/python3 /home/pi/myscript.py > /home/pi/mylog.log 2>&1' &
Rather than running a script upon boot we can run a script each time a terminal window is opened, such as upon boot but also with a new SSH connection. To do so we will use
sudo nano /home/pi/.bashrc
Go to the last line of the file and add your commands, e.g. to print a statement and run a python script:
echo Running sample script sudo python /home/pi/sample.py
The program can be aborted with
ctrl-c while it is running!