Raspberry Pi Forums

Hi,

I'm a beginner in programming on raspberry pi. I would like to know is there is any easy way to make a python script that will run my main program when the raspberry pi is on. Also I would like to make this program stop with the moment when the power is off. I have to save my measure data to the file after each run of that program. I've been trying with rc.local and it seems like the program is running but when I reboot the device there is no file with the data gathered. Thanks for your help.

When the power is turned off everything stops, no data will be written to the flash after that.

Also if a program expect to be shut-off at any moment it should always make sure that any data written to a file is "flushed" to the disk as soon as possible.
Look at functions like fflush() and sync(). ( I dont know what they are in Python )

Thanks fot Your reply it helped.