create the share directory
create a group davuser and add users to this group.
$ sudo groupadd davuser $ sudo usermod -a -G davuser johannes $ id johannes uid=1002(johannes) gid=1002(johannes) groups=1002(johannes),1006(davuser)
create the share directory $ sudo mkdir /home/wwwshare $ sudo chown -R www-data:davuser /home/wwwshare $ sudo chmod 770 /home/wwwshare $ ll /home/wwwshare drwxrwx--- 2 www-data davuser 4096 2012-05-29 11:15 ./