[Lua][Question]How to read and write to a file?

My name is Frederikam, and I ran into a problem, related to my turtle losing all data when it unloads. I am fairly new to programming, especially Lua programming, but I have seen this being done in this video. What I want to do with this is making a tree farm with 4 trees in a square formation, but to do this I need to save the position the turtle is in.

I appreciate anyone trying to answer here, even if you don't know how this works.

Doyle3694, on 28 December 2012 - 11:36 PM said:

http://www.computerc...w-to-save-data/

Thank you, I did search for tutorials, but I didn't find this one.