Editing Sleep (section)

== MS-DOS on Windows ==
=== Approach 1: %RANDOM% + ping local ===
Purpose
* Sleep random seconds between 5 ~ 60 seconds

BAT file:
<syntaxhighlight lang="Windows batch files">
REM print current date & time
ECHO %date% %time%

REM sleep 5 ~ 60 seconds
SET /a timeout=%RANDOM% * 55 / 32767 + 5
ping 127.0.0.1 -n %timeout% > nul

REM print current date & time
ECHO %date% %time%
</syntaxhighlight>

Instruction<ref>[https://stackoverflow.com/questions/8258087/bat-random-timeout batch file - .bat random timeout - Stack Overflow]</ref>
* {{kbd | key=<nowiki>%RANDOM%</nowiki>}} returns an integer between 0 and 32767<ref>[https://ss64.com/nt/syntax-random.html Random Numbers - Windows CMD - SS64.com]</ref>.
* 55 is the range of values you want: 5 to 60.
* 32767 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 is '0 to 55'. After plus 5 the range became '5 ~ 65'.
* ping local address: {{kbd | key=<nowiki>/n <Count></nowiki>}} "Specifies the number of echo Request messages sent. The default is 4."<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>

=== Approach 2: sleep package of CygWin ===
Requirement: Install [https://cygwin.com/install.html Cygwin] on {{Win}} & install {{kbd | key=<nowiki>sleep</nowiki>}} package (How-to: [https://x.cygwin.com/docs/ug/setup.html Setting Up Cygwin/X])

Verify the installation of {{kbd | key=<nowiki>sleep</nowiki>}} package<ref>[https://stackoverflow.com/questions/9260014/how-do-i-install-cygwin-components-from-the-command-line How do I install cygwin components from the command line? - Stack Overflow]</ref><ref>[http://polarhome.com/service/man/?qf=SLEEP&af=0&tf=2&of=Cygwin SLEEP man page on Cygwin]</ref>
# Key-in {{kbd | key=<nowiki>cmd</nowiki>}} to open command prompt ([https://www.lifewire.com/how-to-open-command-prompt-2618089 How to Open Command Prompt (Windows 10, 8, 7, Vista, XP)])
# Key-in one of following commands
#* Key-in {{kbd | key=<nowiki>where sleep</nowiki>}} if you add installation path of CygWin to system path ([[How to setup my system path]]). Or
#* Key-in {{kbd | key=<nowiki>dir C:\cygwin64\bin\sleep.exe</nowiki>}} if the installation path of CygWin is {{kbd | key=<nowiki>C:\cygwin64\</nowiki>}}.
<pre>
C:\Users\user>dir C:\cygwin64\bin\sleep.exe

# successful condition
C:\cygwin64\bin\sleep.exe

# failed condition
File Not Found
</pre>

BAT file:
<pre>
REM print current date & time
ECHO %date% %time%

REM sleep 5 ~ 60 seconds
SET /a timeout=%RANDOM% * 55 / 32767 + 5
C:\cygwin64\bin\sleep.exe %timeout%

REM print current date & time
ECHO %date% %time%
</pre>

=== Approach 3: TIMEOUT ===
Alternative command: {{exclaim}} The following command {{kbd | key=<nowiki>ECHO %date% %time%</nowiki>}} will not be executed after {{kbd | key=<nowiki>TIMEOUT %timeout%</nowiki>}} was executed.

BAT file:
<pre>
SET /a timeout=%RANDOM% * 55 / 32767 + 5
TIMEOUT %timeout%

ECHO %date% %time%
</pre>