I have ran the command and i have the folder in script-output. How do i view it?

The simplest is to run the command line tool (CLI):
- On Windows, download the latest mapshot-windows.exe from https://github.com/Palats/mapshot/releases and run it from the explorer.
- On Linux, download the latest mapshot-linux from https://github.com/Palats/mapshot/releases , mark it as executable (chmod +x mapshot-linux) and run it: ./mapshot-linux serve

In either case, keep it running; then you just need to go to http://localhost:8080 in your web browser to see the content. Click the mapshot you want to see in the list and it should get displayed.

awesome. thank you

edit: is there anyway to save it as one big screenshot so i could send/post it?

No unfortunately there is no way to do one big screenshot - it would create an image too big if you want to keep details and too blurry otherwise.

That being said, for generating a single image screenshot, you can use directly the game.take_screenshot command in the Factorio console. There are a few info on how to do so on this Reddit thread: https://www.reddit.com/r/factorio/comments/6f1gr6/psa_how_to_take_massive_screenshots/ ; and you can find all parameters of the take_screenshot command there: https://lua-api.factorio.com/latest/LuaGameScript.html#LuaGameScript.take_screenshot