local channels = {}
local contents = nil
local file = "disk/mobSpawnerChannels"
local f = io.open(file, "w")
if f:read("*a") ~= nil then
  contents = f:read("*a")
  channels = textutils.unserialize(contents)
end

if channels[main] == nil then
  channels[main] = os.getComputerID()
end

f:write(textutils.serialize(channels))
f:close()