Run a command for all directories

Question

I have a lot of directories that contain some text files and I would copy all files (of all directories) in a new directory. I'm looking for a bash command that do this. How can I do it?

Answer 1

Try

find source_dir '*.txt' -exec cp -vuni '{}' dest_dir ";"

Answer 2

You can use the this command to copy all the files and subfolders in a directory to another directory:

cp -a /source/. /dest/

Taken from How can I copy the contents of a folder to another folder in a different directory using terminal?

Note: This does not solve OP's question as you cannot use it to only copy files of a certain type along with folders, but I'll leave it here for anyone that might need it.