Bukkit

/spawner <entity>
Switch the spawner you're looking at or holding to the given mob entity type.

/spawner give <entity> [player]
Give a spawner to yourself or another player.

/spawner list
Display the contents of the spawner/list.txt file.

/spawner help
Display the contents of the spawner/help.txt file.

/spawner reload
Reload the plugin. Useful if you make changes to any of the files.