Printing to terminal/standard output problem

[PooshhMao <pooshhmao@...>]

Hi,

My program prints stuff to the console. Most of the time I use just 
print(), but in some cases I prefer to use io.write() and io.flush(), 
for example to show progress on an
operation. The problem is that, when I do, the Lua script won't run 
anymore if not executed from a terminal. At any rate, there's little 
point in showing stuff in the terminal if it's not visible, so I suppose 
I would need to set the standard output to a file. So how can I 
determine if the script is run from a terminal or not?

I use LuaJIT on Kubuntu Linux, if that matters.

Thanks in advance

Ralf