show in GUI stdout of a command

[twigster]

Hi,

I need to display in real time the output of a command line tool in a 
GUI written so far with Tkinter and Pmw. I've got a command line tool 
that I want to integrate to a GUI. The parameters are set using the GUI 
and a button executes the command. The calc is long so I need to see how 
fast it goes. This is given by the stdout...

any idea how to do this?

thanks
Alexandre