China DOS Union

ping -n can achieve delay, but I recognize this is not a good way, because I checked the CPU usage, and when pinging, it has reached 50%. Such a delay, what program are you going to do?

可以变通一下，用 at

Can be flexibly handled, using "at"

It seems that at requires the support of a service. Now many machines, after optimization, have not enabled this service.

Originally posted by nvflash at 2006-9-29 07:47:
at seems to require service support. Now many machines are optimized and this service is not enabled

You can just enable it on your own machine~ If you want to enable it on someone else's machine, you can execute the following to enable it

sc config schedule start= auto
sc start schedule

If you say it's about task scheduling, I've lost confidence. I've tried multiple task scheduling methods many times, and it inexplicably didn't execute correctly. This thing isn't very reliable, I think it's better not to use it.

Hehe, it is suggested that you search for "delay" as there have been many discussions about it before

Summary of Batch Processing Delay Methods:

1. ping

@echo off

:loop

    echo %time%

    ping 127.1 -n 2 1>nul 

    echo %time%

goto loop

Memory Usage: cmd.exe 1704k
ping.exe 2920k
Error Evaluation: High
Advantages: Simple code structure
Disadvantages: High memory usage, relatively large error when delay time is long

2. Still ping

@echo off

:loop

    echo %time%

    ping 1 -n 1 -w 1000 2>nul 1>nul

    echo %time%

goto loop

Memory Usage: cmd.exe 1700k
ping.exe 2912k
Error Evaluation: General
Advantages: Simple code structure, smaller error with longer time, higher accuracy (50ms)
Disadvantages: High memory usage


3. call

@echo off

:loop

    echo %time%

    call :delay 1000

    echo %time%

goto loop



:delay

    set /a num=num + 1

    if %num% geq %1 (set num=) && goto :eof

rem    for /l %%i in (1,1,%1) do echo. >nul

goto :eof

Memory Usage: cmd.exe 1744k
cmd.exe 1740k
Error Evaluation: Very high (greatly affected by CPU frequency, almost impossible to accurately grasp overall delay time)
Advantages: Relatively high accuracy
Disadvantages: Not suitable for occasions requiring precise time grasping

4. msg

@echo off

:loop

    echo %time%

    msg %username% /time:20 /w "Delaying, click OK to cancel delay!"

    echo %time%

goto loop

Memory Usage: cmd.exe 1752k
msg.exe 2620k
Error Evaluation: Low
Advantages: Relatively stable, can cancel delay midway, simple code structure
Disadvantages: Very high memory usage, window pops up (advantage? Disadvantage?)

5. vbs

@echo off

    echo Wscript.Sleep WScript.Arguments(0) >%tmp%\delay.vbs

:loop

    echo %time%

    cscript //b //nologo %tmp%\delay.vbs 2000

    echo %time%

goto loop

Memory Usage: cscript.exe 4812k
cmd.exe 1708k
Error Evaluation: Very low
Advantages: Highest accuracy, more flexible and convenient to use
Disadvantages: Temporary file generated, high memory usage


End:
1. Limited test conditions, the above data is not authoritative.
2. About accuracy.
Actually, any command with adjustable time has relatively high accuracy, the reason for being affected depends on the number of command executions, the more times, the lower the accuracy. And the reason why the fifth scheme is said to have the highest accuracy can be exemplified: cscript //b //nologo delay.vbs 2036, while the second scheme is still worse than the fifth scheme due to the minimum accuracy.
3. Everyone is welcome to supplement.
Reference Links:
1.Trouble Caused by a GIF File
2. Heterodoxy in Batch Processing Programming


[ Last edited by 3742668 on 2006-9-29 at 08:49 ]

Can you explain why you need to perform a delay operation?

Excuse me, moderator, besides %time%, what other system-built-in variables are there?

Originally posted by nvflash at 2006-9-29 09:11:
May I ask the moderator, besides %time%, what are other system-built-in variables?

1. Run the command set without parameters
2. Run the command set /?, at the end.

Recommend a standard POSIX command: sleep, for example:

Sleep for 10 seconds
sleep 10s

1 minute
sleep 1m

2 hours
sleep 2h

5 days:
sleep 5d

The attachment is the win32 version of sleep. It may be not very convenient for batch processing that needs to be spread around. It's good for personal use.

This is good.
Support

@echo off
echo Current seconds: %time:~6,-3%
set /p dalay="Enter the delay in seconds within 60: "%dalay%
:compte
if not "%dalay%"=="%time:~6,-3%" goto compte
echo Time's up!! Pay the bill!
pause>nul