From: batchman@dosville.foo   
      
   On Wed, 05 Dec 2018 04:16:24 +0700, JJ wrote:   
      
   > How to prevent the batch file from abruptly terminated if `goto` is   
   > executed with a non existing label?   
   >   
   You need to test that the `value' being returned in the num variable is   
   acceptable to your program.   
      
   set ok=   
   for %%n in (1 2 3 4 5) do if (%%n)==(%num%) set ok=!   
   if not (%ok%)==() goto task%num%   
   REM drops down for incorrect input   
   echo Invalid input, dummy!   
      
   NOTE haven't tested this, leaving that for you to complete.   
      
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