user@server:/$ df -h
Filesystem                       Size  Used Avail Use% Mounted on
udev                             3.9G     0  3.9G   0% /dev
tmpfs                            799M  8.8M  790M   2% /run
/dev/sda1                         16G   16G     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
SOMERANDOMIP:/volume2/logfiles   18T  6.6T   11T  38% /data/logfiles
tmpfs                            799M     0  799M   0% /run/user/1000
user@server:
user@server: 
user@server:/$ sudo du -hsx /* | sort -rh | head -n 40
du: cannot access '/proc/16754/task/16754/fd/3': No such file or directory
du: cannot access '/proc/16754/task/16754/fdinfo/3': No such file or directory
du: cannot access '/proc/16754/fd/3': No such file or directory
du: cannot access '/proc/16754/fdinfo/3': No such file or directory
886M    /usr
875M    /lib
415M    /var
79M     /boot
16M     /bin
14M     /sbin
8.8M    /run
5.4M    /etc
76K     /home
28K     /tmp
20K     /root
16K     /lost+found
12K     /media
4.0K    /srv
4.0K    /snap
4.0K    /opt
4.0K    /mnt
4.0K    /lib64
4.0K    /data
0       /vmlinuz.old
0       /vmlinuz
0       /sys
0       /proc
0       /initrd.img.old
0       /initrd.img
0       /dev