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local function readN(len, replaceChar)
          len = len or 12
          local input=""
          local key = 0
          term.setCursorBlink(true)
          repeat
                local e,p1 = os.pullEvent()
                if e=="char" then
                  if #input < len then
                        input = input .. p1
                        term.write(replaceChar or p1)
                  end
                elseif e=="key" and p1==keys.backspace and #input > 0 then
                  input = input:sub(1,#input-1)
                  local x,y = term.getCursorPos()
                  term.setCursorPos(x-1,y)
                  term.write(" ")
                  term.setCursorPos(x-1,y)
                end
          until p1==keys.enter
          term.setCursorBlink(false)
          return input
        end

        sid = 0
        lockdown = 0
        actc = ""
        actpw = ""
        actpc = ""
        userlog = ""
        userpas = ""
        puselog = ""
        prog = 0

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

        function menu(id, text)
          if sid == id then
                write">> "
          else
                write"   "
          end
          print(text)
        end

        clear()
        while prog == 0 do
        os.pullEvent = os.pullEventRaw
        rep1 = 0
        rep2 = 0
        rep3 = 0
        rep4 = 0
        rep5 = 0
        rep6 = 0
        ioerror = 0
        term.setCursorPos(1, 12)
        term.clearLine()
        term.setCursorPos(1, 13)
        term.clearLine()
        term.setCursorPos(1, 14)
        term.clearLine()
        term.setCursorPos(1, 15)
        term.clearLine()
        term.setCursorPos(1, 16)
        term.clearLine()
        term.setCursorPos(1, 17)
        term.clearLine()
        term.setCursorPos(1,1)
        print("|################################################|")
        print("|                          BOUTECH SYSTEM LOGIN                    |")
        print("|                                OS Version : 1.3                                |")
        print("|################################################|")
        term.setCursorPos(13,7)
        print("|------------------------|")
        term.setCursorPos(13,8)
        print("|                                                |")
        term.setCursorPos(13,9)
        print("|                                                |")
        term.setCursorPos(13,10)
        print("|                                                |")
        term.setCursorPos(13,11)
        print("|------------------------|")
        term.setCursorPos(16,8)
        menu(0, "Login")
        term.setCursorPos(16,9)
        menu(1, "Create Account")
        term.setCursorPos(16,10)
        menu(2, "Shutdown")
        event, key = os.pullEvent("key")

        if key == 200 then
          if sid == 0 then
                sid = sid+2
          elseif sid == 1 then
                sid = sid-1
          elseif sid == 2 then
                sid = sid-1
          end
        elseif key == 208 then
          if sid == 2 then
                sid = sid-2
          elseif sid == 1 then
                sid = sid+1
          elseif sid == 0 then
                sid = sid+1
          end
        elseif key == 28 then
          if sid == 0 then
                term.setCursorPos(13, 12)
                print("|   Enter Credentials.   |")
                term.setCursorPos(13, 13)
                print("|                                                |")
                term.setCursorPos(13, 14)
                print("|                                                |")
                term.setCursorPos(13, 15)
                print("|                                                |")
                term.setCursorPos(13, 16)
                print("|                                                |")
                term.setCursorPos(13, 17)
                print("|------------------------|")

                while rep5 == 0 do
                  term.setCursorPos(1, 14)
                  term.clearLine()
                  term.setCursorPos(1, 16)
                  term.clearLine()
                  term.setCursorPos(13, 16)
                  print("|                                              |")
                  term.setCursorPos(13, 14)
                  print("|                                              |")
                  term.setCursorPos(15, 14)
                  write("Username: ")
                  userlog = readN()
                  if userlog == "adminovrride" then
                        rnd = math.random(100, 500)
                        term.setCursorPos(1, 18)
                        term.clearLine()
                        term.setCursorPos (17, 18)
                        print("Override Code: ".. rnd)
                        apass = tostring((rnd + 11) * 83)
                        term.setCursorPos(1, 16)
                        term.clearLine()
                        term.setCursorPos(13, 16)
                        print("|                                                |")
                        term.setCursorPos(15, 16)
                        write("Password: ")
                        ovrpass = readN(12, "*")
                        if ovrpass == apass then
                          term.setCursorPos(1, 18)
                          term.clearLine()
                          term.setCursorPos(15, 18)
                          print("Override Successful...")
                          sleep(3)
                          term.clear()
                          term.setCursorPos(1, 1)
                          rep5 = rep5+1
                          rep6 = rep6+1
                          prog = prog+1
                        else
                          term.setCursorPos(1, 18)
                          term.clearLine()
                          term.setCursorPos(15, 18)
                          print("  Override Failed...")
                          sleep(1)
                          rep5 = rep5+1
                          rep6 = rep6+1
                          sid = 0
                        end
                  else
                        if userlog == "" then
                          term.setCursorPos(1, 18)
                          term.clearLine()
                          term.setCursorPos(18, 18)
                          print("Invalid Username")
                          sleep(1)
                          ioerror = ioerror+1
                          if ioerror == 3 then
                                rep5 = rep5+1
                                rep6 = rep6+1
                                sid = 0
                          else
                          end
                        else
                          ioerror = 0
                          ulog = fs.exists("users/".. userlog)
                          if ulog == true then
                                term.setCursorPos(1, 16)
                                term.clearLine()
                                term.setCursorPos(13, 16)
                                print("|                                                |")
                                term.setCursorPos(15, 16)
                                write("Password: ")
                                userpas = readN(12, "*")
                                if userpas == "" then
                                  term.setCursorPos(1, 18)
                                  term.clearLine()
                                  term.setCursorPos(15, 18)
                                  print("Invalid Password Entry")
                                  sleep(1)
                                  ioerror = ioerror+1
                                  term.setCursorPos(1, 18)
                                  term.clearLine()
                                  if ioerror == 3 then
                                        rep5 = rep5+1
                                        sid = 0
                                  else
                                  end
                                else
                                  ulog = io.open("users/".. userlog, "r") or nil
                                  pass = ulog and ulog:read()
                                  ulog:close()
                                  if (pass and pass==userpas) then
                                        term.setCursorPos(1, 18)
                                        term.clearLine()
                                        term.setCursorPos(16, 18)
                                        print("  Login Success...")
                                        rep5 = rep5+1
                                        rep6 = rep6+1
                                        sid = 0
                                        sleep(2)
                                        --Put your shell.run([PROGRAM]) here to move into the system you had locked by this program.
                                  else
                                        if lockdown < 2 then
                                          term.setCursorPos(1, 18)
                                          term.clearLine()
                                          term.setCursorPos(16, 18)
                                          print("   Wrong Password")
                                          sleep(1)
                                          if userlog == puselog then
                                                lockdown = lockdown+1
                                          else
                                                lockdown = 0
                                                puselog = userlog
                                                lockdown = lockdown+1
                                          end
                                        else
                                          while rep6 == 0 do
                                                term.setCursorPos(15, 18)
                                                rnd = tostring(math.random(101, 999))
                                                if not fs.exists("pending/".. rnd) then
                                                  fs.move("users/".. userlog, "pending/".. rnd)
                                                  term.setCursorPos(1, 18)
                                                  term.clearLine()
                                                  term.setCursorPos(15, 18)
                                                  print(" Lockdown Ref #: "..rnd)
                                                  sleep(1)
                                                  ulog = fs.open("pending/".. rnd, "a")
                                                  ulog.writeLine("Username: ".. userlog)
                                                  ulog.close()
                                                  rep6 = rep6+1
                                                  rep5 = rep5+1
                                                  sid = 0
                                                else
                                                end
                                          end
                                        end
                                  end
                                end
                          else
                                term.setCursorPos(14, 18)
                                print("  Bad/Unknown Username")
                                sleep(1)
                          end
                        end
                  end
                end
          elseif sid == 1 then
                term.setCursorPos(13, 12)
                print("|  Submit Account Info.  |")
                term.setCursorPos(13, 13)
                print("|                                                |")
                term.setCursorPos(13, 14)
                print("|                                                |")
                term.setCursorPos(13, 15)
                print("|                                                |")
                term.setCursorPos(13, 16)
                print("|                                                |")
                term.setCursorPos(13, 17)
                print("|------------------------|")

                while rep1 == 0 do
                  term.setCursorPos(1, 14)
                  term.clearLine()
                  term.setCursorPos(13, 14)
                  print("|                                              |")
                  term.setCursorPos(15, 14)
                  write("Username: ")
                  input = readN()
                  actc = input
                  actex = fs.exists("users/".. actc)
                  if input == "adminovrride" then
                        term.setCursorPos(1, 18)
                        term.clearLine()
                        term.setCursorPos(18, 18)
                        print("Invalid Username")
                        sleep(1)
                        ioerror = ioerror+1
                        if ioerror == 3 then
                          rep1 = 1
                          rep2 = 1
                          rep3 = 1
                          sid = 0
                        else
                        end
                  else
                        if input == "" then
                          term.setCursorPos(1, 18)
                          term.clearLine()
                          term.setCursorPos(18, 18)
                          print("Invalid Username")
                          sleep(1)
                          ioerror = ioerror+1
                          if ioerror == 3 then
                                rep1 = 1
                                rep2 = 1
                                rep3 = 1
                                sid = 0
                          else
                          end
                        elseif actex == true then
                          term.setCursorPos(1, 18)
                          term.clearLine()
                          term.setCursorPos(15, 18)
                          print (" Username Unavailable")
                          sleep(1)
                        else
                          ioerror = 0
                          rep1 = 1
                        end
                  end
                end

                while rep2 == 0 do
                  while rep3 == 0 do
                        term.setCursorPos(15, 15)
                        write("Password: ")
                        input = readN(12, "*")
                        if input == "" then
                          term.setCursorPos(1, 18)
                          term.clearLine()
                          term.setCursorPos(15, 18)
                          print("Invalid Password Entry")
                          sleep(1)
                          ioerror = ioerror+1
                          if ioerror == 3 then
                                rep1 = 1
                                rep2 = 1
                                rep3 = 1
                          else
                          end
                        else
                          ioerror = 0
                          actpw = input
                          rep3 = 1
                          rep2 = 1
                        end
                  end

                  term.setCursorPos(13, 16)
                  print("|                                              |")
                  term.setCursorPos(15, 16)
                  write("Confirm : ")
                  input = readN(12, "*")
                  actpc = input
                  if (actpc) == (actpw) then
                        while rep4 == 0 do
                          rnd = tostring(math.random(1011, 9999))
                          if not fs.exists("pending/".. rnd) then
                                file = fs.open("pending/".. rnd, "w")
                                file.writeLine(actc)
                                file.writeLine(actpw)
                                file.close()
                                rep4 = rep4+1
                          else
                          end
                        end
                        term.setCursorPos(1, 18)
                        term.clearLine()
                        term.setCursorPos(13, 18)
                        print("  Pending... Ref #: ", rnd)
                        sleep(1)
                        ioerror = 0
                        rep2 = 1
                        sid = 0
                  else
                        term.setCursorPos(1, 18)
                        term.clearLine()
                        term.setCursorPos(15, 18)
                        print("Password Doesn't Match")
                        sleep(1)
                        rep2 = 0
                        ioerror = ioerror+1
                        if ioerror == 3 then
                          rep1 = 1
                          rep2 = 1
                          rep3 = 1
                        else
                        end
                  end
                end

          elseif sid == 2 then
                term.setCursorPos(13,14)
                print("|########################|")
                term.setCursorPos(13,15)
                print("# SYSTEM SHUTTING DOWN!! #")
                term.setCursorPos(13,16)
                print("|########################|")
                sleep(3)
                os.shutdown()
                end
          end
        end