Sleep: Difference between revisions
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* 32768 is the range of values returned by {{kbd | key=<nowiki>%RANDOM%</nowiki>}} (0 to 32767). | * 32768 is the range of values returned by {{kbd | key=<nowiki>%RANDOM%</nowiki>}} (0 to 32767). | ||
* 5 is the minimum value you want. The original range of values you want '0 to 60' became '5 ~ 65'. | * 5 is the minimum value you want. The original range of values you want '0 to 60' became '5 ~ 65'. | ||
* ping local address<ref>[https://stackoverflow.com/questions/735285/how-to-wait-in-a-batch-script windows xp - How to wait in a batch script? - Stack Overflow]</ref> | * ping local address<ref>[https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/ping time]</ref><ref>[https://stackoverflow.com/questions/735285/how-to-wait-in-a-batch-script windows xp - How to wait in a batch script? - Stack Overflow]</ref> | ||
BAT file: | BAT file: | ||
Revision as of 10:31, 4 November 2018
Sleep random seconds in programming
MS-DOS
Approach 1: %RANDOM% + ping local
batch file - .bat random timeout - Stack Overflow
- %RANDOM% returns an integer between 0 and 32767.
- 60 is the range of values you want: 0 to 60.
- 32768 is the range of values returned by %RANDOM% (0 to 32767).
- 5 is the minimum value you want. The original range of values you want '0 to 60' became '5 ~ 65'.
- ping local address[1][2]
BAT file:
REM print current date & time ECHO %date% %time% REM sleep 5 ~ 65 seconds SET /a timeout=%RANDOM% * 60 / 32768 + 5 ping 127.0.0.1 -n %timeout% > nul REM print current date & time ECHO %date% %time%
Approach 2: sleep package of CygWin
Requirement: Install Cygwin on Win 
& install sleep package
Verify the installation of sleep package[3][4]
- Key-in cmd to open command prompt (How to Open Command Prompt (Windows 10, 8, 7, Vista, XP))
- Key-in one of following command
- Key-in where sleep if you add installation path of CygWin to system path (How to setup my system path). Or
- Key-in dir C:\cygwin64\bin\sleep.exe if the installation path of CygWin is C:\cygwin64\.
C:\Users\user>dir C:\cygwin64\bin\sleep.exe # successful condition C:\cygwin64\bin\sleep.exe # failed condition File Not Found
BAT file:
REM print current date & time ECHO %date% %time% REM sleep 5 ~ 65 seconds SET /a timeout=%RANDOM% * 60 / 32768 + 5 C:\cygwin64\bin\sleep.exe %timeout% REM print current date & time ECHO %date% %time%
Approach 3: TIMEOUT
Alternative command: 
The following command ECHO %date% %time% will not be executed after TIMEOUT %timeout% was executed.
BAT file:
SET /a timeout=%RANDOM% * 60 / 32768 + 5 TIMEOUT %timeout% ECHO %date% %time%
BASH
Tested on Linux 
& macOS 
[5]
# print current date & time echo $(date '+%Y-%m-%d %H:%M:%S') # sleep 5 ~ 65 seconds timeout=$(($RANDOM * 60 / 32768 + 5)) sleep $timeout # print current date & time echo $(date '+%Y-%m-%d %H:%M:%S')