jon@gimli:~$ quodlibet --help
Usage: /usr/local/bin/quodlibet [ --refresh-library | --print-playing | control ]
Quod Libet - a music library and player

  --enqueue=filename|query      Enqueue a file or query
  --filter=tag=value            Filter on a tag value
  --focus                       Focus the running player
  --hide-window                 Hide main window
  --next                        Jump to next song
  --open-browser=BrowserName    Open a new browser
  --order=[order]|toggle        Set or toggle the playback order
  --pause                       Pause playback
  --play                        Start playback
  --play-file=filename          Play a file
  --play-pause                  Toggle play/pause mode
  --previous                    Jump to previous song
  --print-playing               Print the playing song and exit
  --print-playlist              Print the current playlist
  --print-queue                 Print the contents of the queue
  --query=query                 Search your audio library
  --queue=on|off|t              Show or hide the queue
  --quit                        Exit Quod Libet
  --random=tag                  Filter on a random value
  --refresh-library             Rescan your library and exit
  --repeat=0|1|t                Turn repeat off, on, or toggle it
  --seek=[+|-][HH:]MM:SS        Seek within the playing song
  --set-browser=BrowserName     Set the current browser
  --set-rating=0.0..1.0         Rate the playing song
  --show-window                 Show main window
  --song-list=on|off|t          Show or hide the main song list
  --start-playing               Begin playing immediately
  --status                      Print player status
  --toggle-window               Toggle main window visibility
  --volume=+|-|0..100           Set the volume
  --volume-down                 Turn down volume
  --volume-up                   Turn up volume

  --help                        Display brief usage information
  --version                     Display version and copyright

jon@gimli:~$