China DOS Union

It's like this: I wanted to block execution display, to avoid too many >nul and @echo off lines in the bat, so I used ctty nul at the start. On the screen there was only ctty nul and the cursor (how do you block ctty nul itself?), the contents did execute, but everything was blocked, so how can I get back to the prompt?
The error prompt turned out to be because I had named the batch file itself Ctty.bat, (pure DOS); hehe... but there is an error prompt in XP's CMD, probably because it's a pure DOS command... many thanks!

Re xiaojun:

Use this to restore display: ctty con

Oh, thanks for the help, problem solved...!!!

The following is quoted from xiaojun at 2004-2-3 14:10:21:
It's like this: I wanted to block execution display , to avoid too many >nul and @echo off lines in the bat, so I used ctty nul at the start. On the screen there was only ctty nul and the cursor (how do you block ctty nul itself?), the contents did execute, but everything was blocked, so how can I get back to the prompt?

Just use @CTTY NUL

Take a look! Learn something!

@CTTY NUL can block the screen output when a BAT file is executing!

Then how can you block the screen output when config.sys is loading programs?

A question for all the DOS experts here

After reading everyone’s discussion here, I learned a few things. In WIN9X, crashes caused by certain devices and device drivers have long been an old loophole, so I might as well mention it here, hehe
CON、NUL、AUX、CLOCK$、CONFIG$
CON\NUL CON\CON NUL\NUL NUL\CON AUX\NUL as soon as any of these are executed, Win9X will immediately hang
CLOCK$ : System clock (system clock) CON : Console (console) AUX : COM1 (serial port) NUL : Dummy Port (null port) CONFIG$ I’m not too clear on this one, so if anyone knows, please tell me. But this loophole is gone in the NT series systems. It seems the reserved names of these devices cause some kind of overflow loophole, hehe

Originally posted by Roy at 2003-8-16 00:00:
Ultimate secret technique!! Force a 10-second delay!!
type nul|choice /c:! /t:!,10 /n Please wait for 10 seconds...

Haha, this is great!

Why does this line sound so much like what Shiryu says in Saint Seiya? (Taste the ultimate secret of the Dragon constellation that can make the Lushan waterfall flow backward — Rozan Shoryu Ha!!!)

Try not to use external commands