How to write a bash script to search and copy files?

Question

bash

Greetings!
There is a file filename123.txt, I need to search 500 directories for filename123.exe, and if such a file exists, then copy it to filename123.txt
, now let's say I have a directory in which:
filename123.txt.
filenameAD.txt
...
1filename.txt
B I need to do such a search for each. Can you give me some hints on how to do this?

Answer 1

I'm assuming that since you're asking this question, you're not familiar enough with the capabilities of the find command. I offer you not just a help for this command, but a whole service , for those who have not yet memorized the parameters.

Answer 2

Why a script when one command is enough: find ??