some info please!

[Andreas]

could some1 say me whats the command , to check if the user have already an item in the bag , like this : to check and if he have to not igve him that item ( lets say an exp potion ) so if he already have it in bag , then to not give him again
sorry for my bad englsih

 

[Tom27]

#IF
CHECKITEM (Name of item)

 

[^G0trex]

#IF
CHECKITEM ExpPotion
#SAY
You already have an exp potion.
#ELSEACT
GIVE ExpPotion