advaned command pc duo

local function rev()
local o = {os.pullEvent("modem_message")}
if type(o[4]) == "string" then
local p = loadstring("return "..o[4])
if p then
return p()
end
end
return nil
end
local m = peripheral.find("modem")
m.open(1)

local function snd(...)
local s = textutils.serialize({...})
m.transmit(1,1,s)
end

if commands then
commands.setblock("~","~4","~","minecraft:grass")
while true do
snd(commands.exec(unpack(rev())))
end
else
local l= peripheral.find"computer"
l.turnOn()
local function ex(...)
snd(...)
return rev()
end
commands = setmetatable({exec=ex},{__index=function(t,k) return function(...) ex(k,...) end end})
end