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-offscreen ?<width>x<height>? --> to launch GiD in OffScreen mode (with no graphic window)
--> using an in memory framebuffer of <width> x <height> pixels (by default 960x640)
--> This option is useful to launch GiD in batch mode (in background) to create images and animations without any graphic feedback, for instance to create very large animation using a batch queue on a remote computer or in background.
-output file_name -> Writes GiD's stdout into $file_name file.
-error file_name -> Writes GiD's stderr into $file_name file.
-noredirect -> do not redirect standard error not standard output to files
-no_splash_window -> to avoid splash window in some special cases (in general can be disabled in preferences)