root@fstest3:/tmp# df -h
Filesystem                    Size  Used Avail Use% Mounted on
udev                          3.9G     0  3.9G   0% /dev
tmpfs                         788M  8.9M  779M   2% /run
/dev/mapper/fstest3--vg-root  108G  105G     0 100% /
tmpfs                         3.9G     0  3.9G   0% /dev/shm
tmpfs                         5.0M     0  5.0M   0% /run/lock
tmpfs                         3.9G     0  3.9G   0% /sys/fs/cgroup
/dev/sda2                     721M   66M  619M  10% /boot
/dev/sda1                     511M  3.6M  508M   1% /boot/efi
tmpfs                         788M     0  788M   0% /run/user/1000
root@fstest3:/tmp# cd /
root@fstest3:/# du -cksh *
16M     bin
69M     boot
0       dev
5.4M    etc
24K     home
0       initrd.img
495M    lib
4.0K    lib64
16K     lost+found
8.0K    media
4.0K    mnt
4.0K    opt
du: cannot access 'proc/3739/task/3739/fd/4': No such file or directory
du: cannot access 'proc/3739/task/3739/fdinfo/4': No such file or directory
du: cannot access 'proc/3739/fd/4': No such file or directory
du: cannot access 'proc/3739/fdinfo/4': No such file or directory
0       proc
44K     root
8.9M    run
13M     sbin
8.0K    snap
4.0K    srv
0       sys
24K     tmp
660M    usr
319M    var
0       vmlinuz
1.6G    total