How Merge 1 Video to 100 Videos (Intro + Multiple Main Videos) help

[Squid Ward]

i have 1 Video Intro that i would like to add to multiple videos

the output should have same name

i'm using ffmpeg the problem is i'm new and the only script that i can copy is :

for %%A IN (*.mpg) DO ffmpeg -i "concat:test.mpg|%%A"  -c copy "new_%%A"

and that script is useless in terminal

i have read, this thread
https://forum.videohelp.com/threads/394659-Batch-add-intro-to-Videos-using-FFMPEG?
and
https://superuser.com/questions/1547914/ffmpeg-concat-one-intro-video-to-many-file-in-...ectory-all-mp4


Anyone can help ?
Appreciated much

Edit 1: i have found a way to create list for my video files using ffmpeg code

printf "file '%s'\n" ./*.mp4 > mylist.txt

now on need to figure how to create a ffmpeg code to run mylist to generate videos (intro + main)
the illustration of coding something like below
create "intro.mp4 + mylist.txt = intro.mp4 + "name of file on mylist.txt 1"
intro.mp4 + "name of file on mylist.txt 2"
intro.mp4 + "name of file on mylist.txt 3"
intro.mp4 + "name of file on mylist.txt 4"
so on until 100

Edit 2 all of my videos have same res, bit rate, everything, just needed to combine them