www:~# pwd
/root
www:~# ls -al bbb
-rw-r--r--  1 root root 29546 2007-09-17 18:32 bbb
www:~# cp bbb /
cp: cannot create regular file `/bbb': No space left on device

www:~# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda1              64G   29G   33G  47% /
tmpfs                 443M     0  443M   0% /dev/shm
/dev/sda3             883M  8.1M  828M   1% /tmp