turtle remote cmd

function eval(command)
fp=fs.open("eval","w")
fp.writeLine(command)
fp.close()
shell.run("eval")
shell.run("rm eval")
end

if turtle==nil then
    --pocket computer
    rednet.open("back")
    while true do
        rednet.broadcast(io.read())
    end
else
    --turtle
    rednet.open("right")
    while true do
        event, side, frequency, replyFrequency, message, distance =os.pullEvent("modem_message")
        eval(message.message)
    end
end