change chmod or other permissons for folder and subfolders

change folder and subfolders:
find /var/www/folder -type d -exec chmod 770 {} \;

change files in folder and subfolders:
find /var/www/folder -type f -exec chmod 660 {} \;

of course "chmod 660" can be replaced with "chown user" or something else ...

or

chmod -R a+rX *

capital X only for folders!

small x for files!