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https://github.com/retropie/RetroPie-Setup/wiki/Doom

The wiki page for Doom gives an example of the script file you need to create.

#!/bin/bash
/opt/retropie/supplementary/runcommand/runcommand.sh 0 "/opt/retropie/emulators/retroarch/bin/retroarch -L /opt/retropie/libretrocores/lr-prboom/prboom_libretro.so --config /opt/retropie/configs/doom/retroarch.cfg /home/pi/RetroPie/roms/ports/doom/doom2.wad" "lr-prboom"