You need it if you want to modify the directory structure that find is traversing, so as to affect subsequent traversal, eg http://www.chiark.greenend.org.uk/~p

You need it if you want to modify the directory structure that find is traversing, so as to affect subsequent traversal, eg http://www.chiark.greenend.org.uk/~pmaydell/find/primes http://www.chiark.greenend.org.uk/~pmaydell/find/primes (cheatsheet here: http://www.chiark.greenend.org.uk/~pmaydell/find/primes-commented http://www.chiark.greenend.org.uk/~pmaydell/find/primes-comm...) Admittedly I wrote that nearly 20 years ago so I guess it doesn't invalidate your point :-)