I need to create a batch file to insert the file name into the first line of approximately 700,000 text files, can anybody help?

if you don't care about a "" sign at the end, this might help

====================
@echo off
md done
copy mtext.txt+%1 done\%1
====================

where mtext.txt is:
====================
Your Text

====================

or you could use a "for" command to append it line by line, but I wouldn't use it for my sensitive texts

Try this:

::== nameinto.bat
@echo off

for %%T in (*.txt) do call :sub1 %%T
goto :eof

:sub1

echo %1>#
copy /b #+%1 ## > nul
del %1
ren ## %1
goto :eof
:: DONE

If at first you don't succeed, you're about average.

M2