Bukkit

How to use Tab-Completion

Select object to edit

/nbt [tab]
it will offer: objects me item block buffer etc

Select player

/nbt *[tab]
it will offer: all online players
/nbt *A[tab]
it will offer: all online players that name starts with "A"

Select offline player

/nbt @[tab]
it will offer: all offline players

Select nearby entity

/nbt id[tab]
it will offer: the first 10 entities in order by increasing distance from the player

Select saved files

/nbt $[tab]
it will offer: all saved .nbt files
/nbt $$[tab]
it will offer: all saved .nbtz files

Browse tags

/nbt object [tab]
it will offer: all tags that object contains
/nbt object compound.[tab]
it will offer: all tags that compound contains
/nbt object array.[tab]
/nbt object array[[tab]
it will offer: all indexes that array contains

Select action

/nbt object [tab]
/nbt object query [tab]
it will offer: all actions that apply to object