for folders(directories):
find . -type d -exec chmod 777 {} \;

for files:
find . -type f -exec chmod 666 {} \;

http://www.blog.highub.com/shell/linux-chmod-777-recursively/comment-page-1/#comment-8350

In order to avoid make files executable,  you can use these to chmod files and directories differently.

Changing permissions recursively by files and directories

files

Bash