demo# df
Filesystem  1K-blocks     Used   Avail Capacity  Mounted on
/dev/ad0s1a    507630   507622  -40602   109%    /
devfs               1        1       0   100%    /dev
/dev/ad0s1e    507630       26  466994     0%    /tmp
/dev/ad0s1f  16544934 11428132 3793208    75%    /usr
/dev/ad0s1d   1124814    38398  996432     4%    /var




demo# du -hcd 1 /
2.0K    /.snap
1.5K    /dev
 26K    /tmp
 11G    /usr
 37M    /var
1.6M    /etc
900K    /bin
 22M    /boot
3.2M    /lib
136K    /libexec
2.0K    /mnt
2.0K    /proc
3.2M    /rescue
 18M    /root
3.4M    /sbin
444M    /~
 11G    /
 11G    total