Hi guys ! Anyone knows how to start a game directly from command line ?

With the MAME emulator, I can simply type: ./mame /roms/folder/rom_name.zip

When I type: ./gngeo -i ../roms/ the frontend starts and then I can choose the game from the games list!
But this frontend is redundant because I'm already using EmulationStation frontend to manage games so I would like to find a way to launch directly roms from EmulationStation, excluding the GnGeo frontend !