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CODE: [Copy to clipboard]@echo off set p=-1 (for /f "delims=" %%i in (a.txt) do ( echo;%%i&set/a n+=1,m=n%%3 set/a test=1/m 2>nul||call :out ))>c.txt exit :out set/a p+=1 if %p% equ 0 (for /f "delims=" %%j in (b.txt) do (echo;%%j&goto eof)) else ( for /f "skip=%p% delims=" %%j in (b.txt) do (echo;%%j&goto eof)) :eof