After installing Hydrogen on your system you can invoke it from the command-line with a number of different options.

-h, --help                  Displays this help.
-v, --version               Displays version information.
-d, --driver <Audiodriver>  Use the selected audio driver (jack, alsa, oss)
-i, --install <File>        Install a drumkit (*.h2drumkit)
-n, --nosplash              Hide splash screen
-p, --playlist <File>       Load a playlist (*.h2playlist) at startup
-P, --data <Path>           Use an alternate system data path
-s, --song <File>           Load a song (*.h2song) at startup
-k, --kit <DrumkitName>     Load a drumkit at startup
-V, --verbose <Level>       Level, if present, may be None, Error, Warning, Info, Debug or 0xHHHH