Difference between _SaveAs and _-SaveAs (Why a dash)

I am trying to save a DXF with a given name from within a script. According to most documentation the command should be:
> _Saveas c:\users\don\documents\bb-1.DXF Scheme Default Enter
This will bring up the file save dialog. In one example it gives the correct syntax of
> _-Saveas c:\users\don\documents\bb-1.DXF _Enter

and yay it finally works.

What is the dash doing?

The dash does exactly what you experienced - it allows you to bypass the dialog box, facilitating scripted and macroed command stringsā€¦ --Mitch

T 'Hanks to Helvetosaur !