UNIX command to recursively change directory permissions?

Question

I just want to change permissions for directories, not the files contained inside.

Answer 1

find . -type d -exec chmod 755 {} +

Answer 2

Assuming you are in the directory you want to start in:

 find . -type d | xargs chmod 755 

or any necessary permissions.

Answer 3

 find . -type d -exec chmod 755 {} \; 

Answer 4

Where do you want to change

 find . -type d | xargs chmod a+x