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# Key-in {{kbd | key=<nowiki>where sleep</nowiki>}} or {{kbd | key=<nowiki>dir C:\cygwin64\bin\sleep.exe</nowiki>}} if the installation path of CygWin is {{kbd | key=<nowiki>C:\cygwin64\</nowiki>}}. | # Key-in {{kbd | key=<nowiki>where sleep</nowiki>}} or {{kbd | key=<nowiki>dir C:\cygwin64\bin\sleep.exe</nowiki>}} if the installation path of CygWin is {{kbd | key=<nowiki>C:\cygwin64\</nowiki>}}. | ||
<pre> | <pre> | ||
C:\Users\user>dir C:\cygwin64\bin\sleep.exe | |||
# successful condition | # successful condition | ||
C:\cygwin64\bin\sleep.exe | C:\cygwin64\bin\sleep.exe | ||
Revision as of 19:38, 3 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]
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[2][3]
- Key-in cmd to open command prompt (How to Open Command Prompt (Windows 10, 8, 7, Vista, XP))
- Key-in where sleep or 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
# 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')