will show you all mounted partitions, their mount point, and storage (used/free)
Code:
$ df -h
Filesystem Size Used Avail Use% Mounted on
rootfs 98G 18G 80G 18% /
udev 1.8G 0 1.8G 0% /dev
tmpfs 1.8G 2.0M 1.8G 1% /dev/shm
tmpfs 1.8G 692K 1.8G 1% /run
/dev/sda2 98G 18G 80G 18% /
tmpfs 1.8G 12K 1.8G 1% /sys/fs/cgroup
/dev/sdb2 155G 131G 17G 89% /home
/dev/sda3 135G 40G 88G 32% /stuff
/dev/sda2 98G 18G 80G 18% /tmp
/dev/sda2 98G 18G 80G 18% /var/tmp
/dev/sdb2 155G 131G 17G 89% /home
/dev/sda1 497M 89M 384M 19% /boot
just like that.