Command Block Args help?

[whizzball1]

I am trying to remove 15 Levels of XP from a player when the Command Block is activated, but regardless of what the player's level is, the command block executes the command, even if the player has 5 levels.
How do I change it so it only executes if the player has 15 or more levels?
My current command is:
/xp -15L @p
What should I add?

 

[Pandemoneus]

Try http://www.minecraftwiki.net/wiki/Command_block#Arguments
I think it should be /xp -15L @p[lm=15]. But I am not sure whether it just ignores that player then and then chooses the next matching one.

 

[whizzball1]

Try http://www.minecraftwiki.net/wiki/Command_block#Arguments
I think it should be /xp -15L @p[lm=15]. But I am not sure whether it just ignores that player then and then chooses the next matching one.

Thanks!
That worked.

 

[immibis]

If the player has less than 15 levels it will choose the closest player to the command block that does have 15 levels.