@echo off
for %%a in (*.csv) do (
for /f "delims=" %%i in ("%%a") do (
    >b.txt echo %%i
    goto c
)
:c
)
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@echo off
for /r %%i in (*.txt) do (
	set /p firstline=<"%%i"
	call echo;%%firstline%%
)
pause & exit /b
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