I'm not gonna give you a file, but here is how to do it.
First,
Do these commands in order.
/scoreboard objectives add Kills totalKillCount Kills
/scoreboard objectives setdisplay sidebar Kills
Second,
Place a Command Block and put this command in it.
testfor @a[score_status_min=1,score_status=1]
Put a comparator leading out of the Command Block
Put another command block where the comparator is sending the power out, put in it
/scoreboard players reset @a
Put a redstone clock going to the command block with testfor in it, and you are done.
