China DOS Union

Using ping -n 1 127.1>nul is used for delaying!! Generally, for batch processing that involves loops, a high execution frequency is not needed. Often, 5 - 10 seconds is sufficient. But if you don't add a delay, continuously executing some commands will consume a lot of CPU resources. Seek a balance!

I like this explanation method and then practice it by myself

Learning

Learned to use nul, haha.

Got it, thank you very much

Is `nul` an internal parameter?
Why does it appear in various versions of DOS?
Is it similar to `NULL` in C&C++?

By the way, I also have a relatively basic question.

Is the principle of DELAY.EXE the same as or exactly doing the same thing as ping -n 1 127.1>nul?

1、nul is not a parameter, but a device name under DOS/Windows, indicating an empty device, which has nothing, and can be understood as a black hole in the universe.

2、The principle of Delay.exe is definitely not achieved by pinging. If you want to know the principle, you can disassemble Delay.exe to look at its disassembly code for analysis.

Originally posted by lxmxn at 2008-3-15 01:11 AM:
1、nul is not a parameter, but a device name under DOS/Windows, representing the null device, which has nothing, and can be understood as a black hole in the universe.

2、The principle of Delay.exe is definitely not achieved by pinging...

thank you for your answer.

The people here are very enthusiastic... Haha

Thanks! Learned it!! Very grateful!!!

Indeed, I have learned a lot, but it's better to focus on practical work applications!