Linux, list directory size and sort

 Linux, command to list directory size and sort:, for example for directory /
 sudo du -mhc  / |sort -h 
For only total size
 sudo du -mhcs  / |sort -h 
Total disk available in G
 df -H
Return:
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/vg_sys-lv_root
                      279G   12G  253G   5% /
tmpfs                 2.1G     0  2.1G   0% /dev/shm
/dev/sda1             500M   86M  388M  19% /boot