How to move files from a folder containing a certain string to another folder?

Question

bash

Help:
there are many (several hundred thousand) files in the folder and in subfolders, you need to find those files that contain a line like XXX=QWERTY and move them to another folder!

Answer 1

cd source_directory_name ; grep -rlZ 'XXX=QWERTY' . | xargs -0 -I{} mv \{} dir_name

Answer 2

thank !