Adding a header into multiple .txt files

Question

I need a batch file that will add the text \"Write In\" in a new line at the beginning of the content of hundreds of .txt files without removing any existing text. I found somet

Answer 1

I would most probably do it like this:

rem // Create temporary header file:
> "head.txt" echo Write In
rem // Iterate all text files in current directory:
for %%F in ("*.txt") do (
    rem /* Combine header and currently iterated text file into a temporary file;
    rem    there cannot arise any file name conflicts (like temporary files becoming
    rem    iterated also unintendedly, or temporary files overwriting files to handle),
    rem    because the extension of the temporary files differ from the text files: */
    copy /B "head.txt"+"%%~F" "%%~F.tmp"
    rem // Overwrite original text file by temporary file, erase the latter:
    move /Y "%%~F.tmp" "%%~F"
)
rem // Erase the temporary header file:
del "head.txt"