Re: How can I find out whether my program is running interactively?

[Luiz Henrique de Figueiredo <lhf@...>]

> I want my program to print out a message when io.stdout is a terminal,
> but not when it is a disk file.  Current solution: write it to
> io.stderr, not io.stdout.  Is there a better way?

Under Unix, you can write to /dev/tty.