du -sh /*
4.0M	/bin
13M	/boot
0	/cdrom
168K	/dev
25M	/etc
269G	/home
4.0K	/initrd
0	/initrd.img
53M	/lib
48K	/lost+found
16K	/media
4.0K	/mnt
35M	/opt
du: cannot read directory `/proc/12223/task': No such file or directory
du: cannot read directory `/proc/12223/fd': No such file or directory
du: cannot access `/proc/12224/task/12224/fd/4': No such file or directory
du: cannot access `/proc/12224/fd/4': No such file or directory
899M	/proc
5.8M	/root
3.5M	/sbin
4.0K	/srv
0	/sys
12K	/tmp
2.6G	/usr
3.5G	/var
0	/vmlinuz