Take a part of the filename and copy it into the file [closed] - batch-file

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I'm looking for a (batch) solution to copy a part of the filename into the textfile. All of the files (thousands) are in one directory and the modified files should go to another directory (let's say c:\tmp ).
The files are called:
0001_Songtitle1.txt
0002_Songtitle2.txt
0003_Songtitle3.txt
The leading number is always 4 digits, ending with a _, whereas the Songtitle can have a different length. I want the number (the first four digits) to be copied into the first row of each file in the following format:
(for the first file) SongID:0001
(for the second file) SongID:0002
(for the third file) SongID:0003
Anybody an idea?
I tried this code:
#echo off
for %%I in (*.txt) do (
echo %%~nI>"%TEMP%\FileName.tmp"
echo/>>"%TEMP%\FileName.tmp"
copy /B "%TEMP%\FileName.tmp" + "%%~I" "%%~I.tmp">nul
del "%%~I"
ren "%%~I.tmp" "%%~nxI"
)
del "%TEMP%\FileName.tmp" 2>nul
It sends the complete filename (without .txt) into the first line. But I struggle to extract just the first four digits.
Thanks,
Ralf

Answer 1

Here is where I meant it to be inserted:
#echo off
for %%I in (????_*.txt) do (
for /f "tokens=1 delims=_" %%J in ("%%~nxI") do (
>"temp.tmp" echo SongID:%%J
>>"temp.tmp" echo/
copy /B "temp.tmp" + "%%~I" "%%~I.tmp">nul
move /y "%%~I.tmp" "%%~nxI" >nul
)
)
del "temp.tmp" 2>nul
I took the freedom to change your code slightly for readability and minor improvements.