df -h
Example output
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/xubuntu--vg-root 684G 12G 637G 2% /
none 4.0K 0 4.0K 0% /sys/fs/cgroup
udev 1.9G 4.0K 1.9G 1% /dev
tmpfs 392M 1.3M 391M 1% /run
none 5.0M 0 5.0M 0% /run/lock
none 2.0G 396K 2.0G 1% /run/shm
none 100M 48K 100M 1% /run/user
/dev/sda1 236M 84M 140M 38% /boot
/home/tss/.Private 684G 12G 637G 2% /home/tss
/dev/sdb1 233G 216G 18G 93% /media/tss/externaldrive