There's a "/blockdata <block> <dataTag>" command to edit block NBT data... but there's no way of editing entity data. The matching "/entitydata <selector> <entity>" command is missing.
MC-65017
/blockdata command exists but /entitydata command doesn't
Resolved
Invalid
0
There has never been a command called /entitydata. The full list of commands can be found here: http://minecraft.gamepedia.com/Commands#List_of_commands