windows batch file call command for 200 times.

call: Calls one batch program from another without stopping the parent batch program. The call command accepts labels as the target of the call.

REM call command for 200 times
FOR /L %%A IN (1,1,200) DO (
	ECHO %%A
	echo generate done
	REM pause

	call work_bat_0.bat
	REM pause
	call work_bat_1.bat

	echo done.
	REM pause
)
pause

&    separates commands on a line.

&&    executes this command only if previous commands errorlevel is 0.

||    (not used above) executes this command only if previous commands errorlevel is NOT 0

>    output to a file

>>    append output to a file

<    input from a file

|    output of one command into the input of another command

^    escapes any of the above, including itself, if needed to be passed to a program

"    parameters with spaces must be enclosed in quotes

+ used with copy to concatenate files. E.G. copy file1+file2 newfile

, used with copy to indicate missing parameters. This updates the files modified date. E.G. copy /b file1,,

%variablename% a inbuilt or user set environmental variable

!variablename! a user set environmental variable expanded at execution time, turned with SetLocal EnableDelayedExpansion command

%<number> (%1) the nth command line parameter passed to a batch file. %0 is the batchfiles name.

%* (%*) the entire command line.

%<a letter> or %%<a letter> (%A or %%A) the variable in a for loop. Single % sign at command prompt and double % sign in a batch file.

ref:

call | Microsoft Docs https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/call cmd - What does “&&” do in this batch file? - Stack Overflow https://stackoverflow.com/questions/28889954/what-does-do-in-this-batch-file#:~:text=%26%26%20runs%20the%20second%20command,with%20an%20errorlevel%20of%201.&text=%26%20separates%20commands%20on%20a%20line.