Recursively change ownership of directories or files
find /www -type d -exec chown root:root {} \;
find /www -type -f -exec chown root:root {} \;
1: find directories under /www and execute the chown command on each directory found and change their ownership to root
2: find files under /www and execute the chown command on each directory found and change their ownership to root
Recursively change permissions for a directory or file
find /www -type d -exec chmod 644 {} \;
find /www -type f -exec chmod 644 {} \;