Default owner and group for new files/folders

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http://serverfault.com – I'm uploading to /var/www via SFTP and wondered how I can get it so when I upload a file or folder it always has the owner and group as www, and have the default chmod as 770. I have tried this so far, chmod 770 /var/www -R chown www:www /var/www -R and I have also tried chmod u+s www -R Currently when I upload a file the owner is the user I'm logged into and group www and chmod is 644. anyone know how to help? (HowTos)