I have a directory that containing files that may or may not contain the same   
   prefix like this :   
      
   xxx_part1.txt   
   xxx_part2.txt   
   yyy_part1.txt   
   yyy_part2.txt   
   zzz_part1.txt   
   zzz_part2.txt   
   aaa_part1.txt   
   bbb_part1.txt   
      
   I need to run a concatenate file commands per each paris like this:   
   copy /b xxx_conc.txt+xxx_part1.txt+xxx_part2.txt   
   copy /b yyy_conc.txt+yyy_part1.txt+yyy_part2.txt   
      
      
   How can I perform this task using for loop. The separator per each prefix is   
   the underscore.   
      
   for /F "tokens=*" %%* in ('dir /b *.RPT') do (   
   copy /b %source2%\%N%_conc.txt+"%%*"   
   )   
      
   Thanks in advance .   
      
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