Computercraft Commandcomputer Playercount

-- This scripts saves current playercount to a file ever 20 seconds. Must be a commandblock computer and chunkloaded.
-- Made this to cirumvent the Rcon playerlist & /testfor bug returning 0 players at all times on MC 1.7.10, reading the file on the webserver

local function SaveFile(data)
    local file = fs.open("playerCount","w")
    sleep(0.1)
    file.write(textutils.serialize(data))
    sleep(0.1)
    file.close()
end

while true do
    ok, result = commands.xp( "0 @a[r=" .. tostring( nLimit ) .. "]" )

    local int=0
    for k,v in pairs(result) do
        int=int+1
    end

    SaveFile(int)
    term.clear()
    term.setCursorPos(1,1)
    print("There are currently "..int.." player(s) online")
    sleep(20)
end