How to merge text files with the same name from all subdirectories?

Question

I have several folders with files. Files can have the same names. I want to concatenate files into one of each name. Thanks in advance.

EDIT: I\'m sorry

Answer 1

merge.bat

@echo off
# for every text file in
# the sub-dirs of current dir
for /r "." %%a in (*.txt) do (
   # filename without path and extension
   echo %%~na
   # read file and append it to file with 
   # the same name prefix in current dir
   type %%a >> %%~na-merged.txt
)

merge_all_in_one.bat

@echo off
for /r "." %%a in (*) do (
    type %%a >> all_merged.txt
)