Get disk space usage with df
The df (disk filesystem) command provides an option to display sizes in human readable formats by using the -h flag which prints the results in human readable format (e.g., 1K 2M 3G).
$df -h Filesystem Size Used Avail Use% Mounted on /dev/sda1 107G 94G 7.6G 93% / udev 1.9G 4.0K 1.9G 1% /dev tmpfs 392M 884K 391M 1% /run none 5.0M 0 5.0M 0% /run/lock none 2.0G 39M 1.9G 2% /run/shm cgroup 2.0G 0 2.0G 0% /sys/fs/cgroup