On this page I collect useful console hacks, which do not find place elsewhere on this blog.

Change permission of directories/files only

To, e.g. apply recursively 755 permissions to folders, but not files, you can use the find command:

find /where/to/apply -type d -exec chmod 755 {} +

Completely analog to e.g. apply 644 recursively on files only

find /where/to/apply -type f -exec chmod 644 {} +