Solved Return true or false in onCommand method?

What is the difference between returning true and false in the onCommand method?

 

This is a good plugin.yml :

Code:

name: Ghost Player
main: com.skyost.gp.GhostPlayerPlugin
description: Be ghooooooooost !
version: 1.2
author: Skyost
website: http://dev.bukkit.org/bukkit-mods/ghost-player/
commands:
ghostview:
  aliases: gv
  description: Look at the block in front of you like a ghost.
  usage: Simply type /ghostview or /gv to look at the block in front of you like a ghost.
  permission: ghostplayer.player.ghostview
ghost:
  aliases: g
  description: Turns you into a ghost and allow you to see ghosts.
  usage: Simply type /ghost or /g to turn you into ghost !
  permission: ghostplayer.player.beghost
silentghost:
  aliases: sg
  description: The same than /ghost but doesn't tell "You are a ghost now !".
  usage: Simply type /silentghost or /sg to turn you into ghost !
  permission: ghostplayer.player.beghost
human:
  aliases: h
  description: Turns you into a human and disallow you to see ghosts.
  usage: Simply type /human or /h to turn you into human !
  permission: ghostplayer.player.behuman
silenthuman:
  aliases: sh
  description: The same than /human but doesn't tell "You are an human now !".
  usage: Simply type /silenthuman or /sh to turn you into human !
  permission: ghostplayer.player.behuman
removeghost:
  aliases: rg
  description: Remove <player> from the ghosts.
  usage: Simply type /removeghost <player> or /rg <player> to remove <player> from the ghosts !
  permission: ghostplayer.admin.removeghost
clearsghosts:
  aliases: cg
  description:  Clears all ghosts. May need a small reload/restart before taking any effect !
  usage: Simply type /clearsghosts or /cg to clears all ghosts !
humanworld:
  aliases: hw
  description:  Add a world to the list of the worlds where the plugin is disabled.
  usage: Simply type /humanworld <world> or /hw <world> to add a world where the plugin is disabled !
  permission: ghostplayer.admin.sethumanworld
ghostworld:
  aliases: gw
  description:  Remove a world from the list of the worlds where the plugin is disabled.
  usage: Simply type /ghostworld <world> or /gw <world> to remove a world from the list where the plugin is disabled !
  permission: ghostplayer.admin.setghostworld
ghosthunter:
  aliases: gh
  description:  Turns you into a ghost hunter, not an human but not a ghost !
  usage: Simply type /ghosthunter or /gh to turns you into a ghost hunter !
  permission: ghostplayer.player.beghosthunter
silentghosthunter:
  aliases: sgh
  description:  Turns you into a ghost hunter, not an human but not a ghost and doesn't tell "You are a ghost hunter now !".
  usage: Simply type /silentghosthunter or /sgh to turns you into a ghost hunter !
  permission: ghostplayer.player.beghosthunter
removeghosthunter:
  aliases: rgh
  description:  Remove <player> from the ghosts hunters.
  usage: Simply type /removeghosthunter <player> or /rgh <player> to to remove <player> from the ghosts hunters !
  permission: ghostplayer.player.beghosthunter
permissions:
ghostplayer.player.*:
  description: Give access to every players commands.
  children:
  ghostplayer.player.ghostview: true
  ghostplayer.player.beghost: true
  ghostplayer.player.behuman: true
  ghostplayer.player.beghosthunter: true
ghostplayer.admin.*:
  description: Give access to every administrators commands.
  children:
  ghostplayer.admin.removeghost: true
  ghostplayer.admin.removeghosthunter: true
  ghostplayer.admin.clearsghosts: true
  ghostplayer.admin.sethumanworld: true
  ghostplayer.admin.setghostworld: true
ghostplayer.*:
  description: Give access to every Ghost Player commands.
  children:
  ghostplayer.player.ghostview: true
  ghostplayer.player.beghost: true
  ghostplayer.player.behuman: true
  ghostplayer.player.beghosthunter: true
  ghostplayer.admin.removeghost: true
  ghostplayer.admin.removeghosthunter: true
  ghostplayer.admin.clearsghosts: true
  ghostplayer.admin.sethumanworld: true
  ghostplayer.admin.setghostworld: true
ghostplayer.player.ghostview:
  default: true
  description: Allow you to view a block like a ghost !
ghostplayer.player.beghost:
  default: true
  description: Allow you to be a ghost !
ghostplayer.player.behuman:
  default: true
  description: Allow you to be an human !
ghostplayer.player.beghosthunter:
  default: true
  description: Allow you to be a ghost hunter !
ghostplayer.admin.removeghost:
  default: op
  description: Allow you to remove a player from the ghosts !
ghostplayer.admin.removeghosthunter:
  default: op
  description: Allow you to remove a player from the ghosts hunters !
ghostplayer.admin.clearsghosts:
  default: op
  description: Allow you to clears all ghosts !
ghostplayer.admin.sethumanworld:
  default: op
  description: Allow you to add a world to the list where the plugin is disabled !
ghostplayer.admin.setghostworld:
  default: op
  description: Allow you to remove a world from the list of the worlds where the plugin is disabled !

If the command return false, a message with the 'Usage' will be sent to the player.

 

Ahh okay, thanks.