CC playerdetector (userfriendly)

p=peripheral.wrap("back")

function fileToTable(file)
if fs.exists(file)~=true then
print("file"..file.." not found")
return(false)
end
fp=fs.open(file,"r")
line={}
i=1
line[i]=fp.readLine()
if line[i]==nil then return(false) end
while line[i]~=nil do
i=i+1
line[i]=fp.readLine()
end
return(line)
end

while true do
user, player = os.pullEvent("player")
print(player)
user=fileToTable("users")
i=1
while user[i]~=nil do
if player==user[i] then
rs.setOutput("right",true)
sleep(5)
rs.setOutput("right",false)
sleep(0.2)
end
i=i+1
end
end