Confirmation check?

I am writing a program in which I want a check before the program is run,

I want the program to print "press Enter to continue"

and then wait for the enter key to be pressed but can't find how to do this.

Pretty much any time you want your script to pause, you do so by making it yield, and waiting for it to be resumed by a certain event; for example, if you call sleep(), then the function starts a timer for you and yields until the corresponding timer event is generated.

In this case you want a key event:

print("Press enter to continue...")

repeat
  local event, key = os.pullEvent("key")
until key == keys.enter

See this page on os.pullEvent() for more info.

Thanks for the quick reply, works perfectly