retroarch
RetroArch is a frontend for emulators, game engines and media players.
TLDR
Start in the menu mode
$ retroarch
Start in full screen mode
$ retroarch --fullscreen
List all compiled features
$ retroarch --features
Set the path of a configuration file
$ retroarch --config=[path/to/config_file]
Display help
$ retroarch --help
Display version
$ retroarch --version