function luash(si)
spawn("lua shell",function()
 repeat
 until login()
 print("\f"..MOTD)
 print(_VERSION)
 while true do
  write((os.getenv("PWD") or "").."> ")
  local inp=readln()
  if not inp then break end
  if inp:sub(1,1) == "!" then
   local pth = os.getenv("PATH") or "."
   local s,ptt = inp:sub(2), {}
   for w in s:gmatch("%S+") do table.insert(ptt,w) end
   local prg = table.remove(ptt,1)
   for d in pth:gmatch("[^:]+") do
    _,lex = pcall(fs.exists,d.."/"..prg..".lua")
    _,nex = pcall(fs.exists,d.."/"..prg)
    if lex then
     run(d.."/"..prg..".lua",table.unpack(ptt))
     break
    elseif nex then
     run(d.."/"..prg,table.unpack(ptt))
     break
    end
   end
  elseif inp:sub(1,1) == "$" then
   local s,ptt = inp:sub(2), {}
   for w in s:gmatch("%S+") do table.insert(ptt,w) end
   local prg = table.remove(ptt,1)
   local r={pcall(_ENV[prg],table.unpack(ptt))}
   if r[1] == true then
    table.remove(r,1)
   end
   print(table.unpack(r))
  else
   if inp:sub(1,1) == "=" then
    inp="return "..inp:sub(2)
   end
   local r={pcall(load(inp))}
   if r[1] == true then
    table.remove(r,1)
   end
   print(table.unpack(r))
  end
 end
end,{sI=si})
end