Having said all that, I really recommend that you work from scratch with the official Retropie image instead of your custom made one, as you can't be sure in what ways it differs from the official one, which could create problems if you apply a modification that's meant for the official image.
Initially I tried adding the / & the .zip with what I left out to my modded / custom .img and still couldn't get things going (the single ROM load / launch no menu etc).
With that being said I'm doing a FRESH build on my rpi3b+ as you suggested. So far:
-I downloaded & installed 4.4 retro pi...
-Emulation station up and running, I have wifi setup & working, [added the ROM(s) to the proper folder]
-Despite the fact that I only want ONE single rom I loaded most of .78 MAME set so hopefully once I get this going I can just modify the line of text to correspond to the ONE rom I want to launch.
-TESTED game launch using regular emulation station, game(s) load fine.
-my autostart.sh only currently shows the following without me modifying it:
emulationstation #auto
Next I added in what you said to do and my autostart.sh file now looks like this:
#emulationstation #auto
/opt/retropie/supplementary/runcommand/runcommand.sh 0 _SYS_ arcade '/home/pi/RetroPie/roms/arcade/tmnt.zip'
WORKS ! Loads right to TMNT ! thanks !
Now my focus is to:
-
HIDE bootup text / raspberry logo's. (Minor as machines would be turned on prior to people / the masses seeing it but still want to Hide that stuff anyways with the exception of my own custom splash.
-Major thing is I need a
SAFE SHUTDOWN single press with a hidden inside cabinet micro switch to leave the ROM and shut it down rather than launching it back to any menu, I literally want it to SHUTDOWN from that single ROM. It can be "ESC" or anything on the IPAC so the keystroke doesn't matter i.e. it could be "shift", F8" Whatever... but when hitting it I need it to safely shut the pi down to prevent corruption of the sd card.