Je ne suis pas très fort en skript, mais cela devrait être comme ça:
on join:
if player has permission "joueur.join":
set join message to "&6[&a+ &7Joueur %player%&6]"
on quit:
if player has permission "joueur.join":
set quit message to "&6[&c- &7Joueur %player%&6]"
on join:
if player has permission "vip.join":
set join message to "&6[&a+ &eVIP %player%&6]"
on quit:
if player has permission "vip.join":
set quit message to "&6[&c- &eVIP %player%&6]"
on join:
if player has permission "vipp.join":
set join message to "&6[&a+ &eVIP&c+ &e%player%&6]"
on quit:
if player has permission "vipp.join":
set quit message to "&6[&c- &eVIP&c+ &e%player%&6]"
on join:
if player has permission "legend.join":
set join message to "&6[&a+ &aLégendaire %player%&6]"
on quit:
if player has permission "legend.join":
set quit message to "&6[&c- &aLégendaire %player%&6]"
on join:
if player has permission "yt.join":
set join message to "&6[&a+ &dYT %player%&6]"
on quit:
if player has permission "yt.join":
set quit message to "&6[&c- &dYT %player%&6]"
on join:
if player has permission "build.join":
set join message to "&6[&a+ &bBuilder %player%&6]"
on quit:
if player has permission "build.join":
set quit message to "&6[&c- &bBuilder %player%&6]"
on join:
if player has permission "assistant.join":
set join message to "&6[&a+ &3Assistant %player%&6]"
on quit:
if player has permission "assistant.join":
set quit message to "&6[&c- &3Assistant %player%&6]"
on join:
if player has permission "mod.join":
set join message to "&6[&a+ &cModérateur %player%&6]"
on quit:
if player has permission "mod.join":
set quit message to "&6[&c- &cModérateur %player%&6]"
on join:
if player has permission "smod.join":
set join message to "&6[&a+ &cSuper-Modo %player%&6]"
on quit:
if player has permission "smod.join":
set quit message to "&6[&c- &cSuper-Modo %player%&6]"
on join:
if player has permission "admin.join":
set join message to "&6[&a+ &4Admin %player%&6]"
on quit:
if player has permission "admin.join":
set quit message to "&6[&c- &4Admin %player%&6]"
Il faut bien penser à mettre les permissions aux grades, et ne pas être OP (si tu est OP, tu auras forcement le message de join d'un administrateur..)