From: klee@unibwm.de   
      
   On 26.08.2019 22:48, Anton Shepelev wrote:   
   > Herbert Kleebauer:   
   >   
   >> echo a>a.txt   
   >> echo b>b.txt   
   >> echo c>c.txt   
   >> set list=   
   >> for  %%i in (*.txt) do call set list=%%list%%,%%i   
   >> echo %list%   
   >   
   > Thank you.  What does the double percent in %%list%%   
   > do?  I didn't find an explanation in  the  help  for   
   > either SET or FOR.   
      
   When the line is parsed, %% is replaced by %, so it becomes:   
      
   call set list=%list%,%%i   
      
   when the call is executed, %list% is replaced by the current value.   
      
   For example, if you want to convert a text to upper case,   
   you can use:   
      
   @echo off   
   set text=Hello World 123   
   echo %text%   
      
   for %%i in (A B C D E F G H I J K L M N O P Q R S T U V W X Y Z) do set   
   u[%%i]=%%i   
   for %%i in (a b c d e f g h i j k l m n o p q r s t u v w x v z) do call call   
   set text=%%%%text:%%i=%%u[%%i]%%%%%%   
      
   echo %text%   
      
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