Doing this with find is only marginally more difficult. find . -name '*.txt' -exec rename .log .bak {} \; If your rename is prename by default you can use s

Doing this with find is only marginally more difficult. find . -name '*.txt' -exec rename .log .bak {} \; If your rename is prename by default you can use sed style replacement. Not to disagree with your overall point.