Change all file permissions to 644 and all folder permissions to 755 recursively

find . -type f -exec chmod 644 {} \+

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






find . -type d -perm 777 -exec chmod 755 {} \; (for changing the directory permission)

find . -type f -perm 777 -exec chmod 644 {} \; (for changing the file permission)