How to change permissions for a folder and its subfolders/files in one step?

Question

I would like to change permissions of a folder and all its sub folders and files in one step (command) in Linux.

I have already tried the below command but it works

Answer 1

For Mac OS X 10.7 (Lion), it is:

chmod -R 755 /directory

And yes, as all other say, be careful when doing this.