Build lightmap of world composite from command line

Hi.

Our team make game with world-composite feature. Maps are a one persistant level and around 20 sub-levels. Lighting info is in a sub-level.

We use Lightmap feature for performance in our game.
Before pakaging, I open persistant-level by UE4Editor, load all sub-levels and build lightmap.

I would like to run lightmap build process from command-line.

and I heared that using commandlet for command-line build. but I didn’t found about commandlet.