imported>OCDoc Import: Imported from legacy OpenComputers documentation at ocdoc.cil.li

2026-08-24T08:08:27Z

Imported from legacy OpenComputers documentation at ocdoc.cil.li

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= OC Tutorial: Writing Code =

So, you've [[Tutorial/oc1 basic computer|built your first computer]] and wonder what to do with it?

Well, let's start with the good old, proven, beloved first program. You know which one. First off, let's switch to the `/tmp` folder, which is a small, writable file system each computer comes with. Remember, this gets ''wiped on reboot'', so don't put anything valuable in here!

[[File:https://i.imgur.com/7YdcUbE.png|700px|https://i.imgur.com/7YdcUbE.png]]

As shown in the image, type `edit <filename>`, where `filename` is the name of the file you wish to edit. The `.lua` extension is absolutely optional, I just like to keep it for syntax highlighting when opening the files in an external editor.

Once in the editor, start coding. In our case it's just the boring, uncreative-but-proven `print("Hello World!")`.

[[File:https://i.imgur.com/5F16EEV.png|700px|https://i.imgur.com/5F16EEV.png]]

When you're done, press Ctrl+S to save, then press Ctrl+W to close the editor. If you list the contents of the `/tmp` folder now, you'll see the file has been created. Type its name and press enter to run it:

[[File:https://i.imgur.com/KiHVUMu.png|700px|https://i.imgur.com/KiHVUMu.png]]

Notice that I didn't type the `.lua` extension when running it. The shell will look for files with that extension if it can't find the file with the exact name you specified.

If want your programs to survive reboots, '''continue by reading on [[Tutorial/oc3 hard drives|how to use hard drives]]'''.

== Contents ==

{{:Tutorial/contents}}

Tutorial/oc2 writing code - Revision history

imported>OCDoc Import: Imported from legacy OpenComputers documentation at ocdoc.cil.li