#install retroarch
wget -c "https://buildbot.libretro.com/stable/1.16.0/android/RetroArch.apk" -O /tmp/RetroArch.apk
adb install -g /tmp/RetroArch.apk
#load retroarch and install cores [example: mame-current]
adb shell am start -n com.retroarch/.browser.retroactivity.RetroActivityFuture

#!!!go to "Online Updater" and install all updates at bottom of list!!!!
echo 'Go to "Online Updater" and install all updates at bottom of list.'
echo "Once Complete Press Enter To Continue."
read q

#Download and push roms to Android device
mkdir /tmp/roms
cd /tmp/roms
wget -c "https://archive.org/download/mame-merged/mame-merged/qsound_hle.zip"
wget -c "https://archive.org/download/mame-merged/mame-merged/mvsc.zip"
#adb shell mkdir -p /sdcard/RetroArch/downloads
adb push mvsc.zip qsound_hle.zip /sdcard/RetroArch/downloads

#make sure retroarch is closed
adb shell am force-stop com.retroarch

#cores can be found in /data/data/com.retroarch/cores/
#although you will need root to list them through the shell
#another option it find core commands is here:
#https://pegasus-frontend.org/tools/metagen-android/

#load game with core
adb shell am start -n com.retroarch/.browser.retroactivity.RetroActivityFuture -e ROM /sdcard/RetroArch/downloads/mvsc.zip -e LIBRETRO /data/data/com.retroarch/cores/mamearcade_libretro_android.so -e CONFIGFILE /storage/emulated/0/Android/data/com.retroarch/files/retroarch.cfg -e QUITFOCUS --activity-clear-task --activity-clear-top --activity-no-history