How to move millions of files into one folder?

Question

linux

Hello!
There are 20 folders (in the out folder), each folder has 100 thousand text files. Please tell me how without going into each folder (because the file system hangs) at once move all text files to one folder?

Answer 1

find src_dir -type f -exec mv "{}" dst_dir \;

Answer 2

Linux: mv folder1/* folderFor10kkFiles/
moves all files from folder1 to folderFor10kkFiles
or like this:

find folder1/* ! -name '.' -exec mv {} folderFor10kkFiles \;