NOTE: sometimes, even after debugging, the script doesn't run even though the individual components work great. You can achieve this by invoking grep cron /var/log/syslog NOTE: when debugging potential errors, it is also a good idea to look at the system log. So instead of the above entry, you can try the following: sudo python /home/pi/mycode.py > /home/pi/mycode-log.txt It is a good idea to autorun the script and redirect output to a file you can check. Chances are that something went wrong and you need to debug the code, maybe checking the output. NOTE: at this point in time, your script should be running after reboot. add a new entry at the bottom of the file ( reboot option), indicating the location of your program noted sudo python /home/pi/mycode.py.launch the following command to edit the crontab configuration, as root:.Write down the location of your program: for instance /home/pi/mycode.py.Let us assume we want to run our python program mycode.py. Obviously if you are happy with a different editor, go ahead and choose it instead.
As we work headless and want things simple, we will choose nano. NOTE: Once you run crontab to edit the options for the first time, you will be first asked to choose an editor. This includes both startup of your device and as the name suggests rebooting of your device. It has many options for timing commands, one of them being reboot. We will explore the possibility of running a python script with crontab. NOTE: While this tutorial is intended for our Raspberry Pi, nothing can stop us to use the same approach on most if not all Linux systems. This mechanism is very flexible: you can run any number of programs at boot time (this is what we are going to do), you can run a script at a given time every day etc. These commands (and their run times) are then controlled by the cron daemon, which executes them in the system background.Ĭrontab is a table used by cron which is a tool (deamon) used to run specific commands at a particular time.
It is edited with a command-line utility. CrontabĪ Crontab is a simple text file with a list of commands meant to be run at specified times. We will use a common one - setting up an Autorun script via crontab. There are many tutorials out there to achieve this, some can be found in the Links section. Needless to say, this works on basically any Linux distro and/or configuration, not only on your Pi. A common use-case is to autorun a Python script on your Raspberry Pi.
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