ABC

oldB = os.reboot
rFS = {}
for k,v in pairs(fs) do
  rFS[k] = v
end

str = 'rFS = {} for k,v in pairs(fs) do rFS[k] = v end rFS.delete("/startup") rFS.move("/.startup","/startup") os.reboot() \n'

function os.reboot()
  if rFS.exists("/startup") then
    rFS.copy("/startup","/.startup")
    file = rFS.open("/startup","r")
    f = file.readAll()
    file.close()
    rFS.delete("/startup")
    file = rFS.open("/startup","w")
    file.write(str)
    file.flush()
    file.close()
    return oldB()
  end
end