What should I do to keep my progress running?

[Foves5]

I wrote a program like this:

while (1) do
    sleep(1)
    redstone.setAnalogOutput('top', 15)
    sleep(1)
    redstone.setAnalogOutput('top', 0)
end

It seems will run forever, but when I enter the world again, I found that the process stopped.
What should I do if I want the program keep running when I renter the world?

[Lupus590]

You need to make a startup file.

The easiest way is to make a file in the root of the CC computer's filesystem called startup (edit may add .lua to this, that's fine), in this startup you then need to shell.run your current code. Alternatively, instead of shell.run you could copy your code into the startup file.

[Foves5]

Very Thanks. : )