All command line parameters are case-insensitive.
-portable - GZDB only.
The editor will be launched in portable mode. It will use the "GZBuilder.cfg" located in the program directory instead of the one located in the "%LocalAppData%\Doom Builder\GZBuilder.cfg" to load and save program settings. Log and crash report files will be also created in the program directory.
-nosettings
The editor doesn't load or save program settings.
-delaywindow
Delays showing of the main window.
-map "path\to\mapfile.wad"
The editor will automatically load the specified map.
-resource pk3 notest "c:\GZDoom\gzdoom.pk3" -resource WAD "c:\Doom\DOOM.WAD"