MergePrintIndexed.bat

:: Merge indexed text files and print the result

@ECHO OFF

SETLOCAL EnableDelayedExpansion

:: User Config
SET ina_base=part1_
SET inb_base=part2_
SET out_base=sum12_
SET ext=txt

FOR %%i IN (%ina_base%*.%ext%) DO (
  SET ina_filename=%%i
  SET inb_filename=!ina_filename:%ina_base%=%inb_base%!
  SET out_filename=!ina_filename:%ina_base%=%out_base%!

  COPY !ina_filename! + !inb_filename! !out_filename!

  :: Automatically open, print (default printer) and 
  :: close text files.
  NOTEPAD /P !out_filename!
)

:END