>sudo du -s /*

11908	/bin
122804	/boot
4	/cdrom
17508	/core
0	/dev
12596	/etc
19649868	/home
0	/initrd.img
0	/initrd.img.old
896828	/lib
6152	/lib32
4	/lib64
16	/lost+found
68	/media
4	/mnt
1337388	/opt
du: cannot access '/proc/5020/task/5020/fd/4': No such file or directory
du: cannot access '/proc/5020/task/5020/fdinfo/4': No such file or directory
du: cannot access '/proc/5020/fd/3': No such file or directory
du: cannot access '/proc/5020/fdinfo/3': No such file or directory
0	/proc
1268	/root
du: cannot access '/run/user/1000/gvfs': Permission denied
1596	/run
11904	/sbin
3193035	/snap
4	/srv
1808396	/swapfile
0	/sys
156	/tmp
4831980	/usr
7318788	/var
0	/vmlinuz
0	/vmlinuz.old