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==Add crontab job==
sudo crontab -e
[[File:Crontab-step1.png]]
Choose "1" then press Enter
Add the command line you want to execute at the end of the file that reads like this:
'''@reboot python3 /home/pi/x-c1/fan.py'''
'''PS:'''
1. '''@reboot python /home/pi/x-c1/fan.py''' is a sample command, You '''MUST''' to modify it according to your needs.
2. <span style="color:red;">Please make sure that the file path and file name are correct</span>
[[File:Crontab-2.png|800px]]
Save and exit (CTRK + O and ENTER to save it). In nano editor, you do that by hitting CTRL + X, answering Y and hitting Enter when prompted.
Please run 'sudo reboot' to reboot device to enable crontab job.
==Remove crontab job==
sudo crontab -e
Then remove the command line by yourself.
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