sudo free --human
             total       used       free     shared    buffers     cached
Mem:           15G       2,9G        12G        23M        87M       1,3G
-/+ buffers/cache:       1,5G        14G
Swap:          15G         0B        15G


sudo df --human
/dev/sda3       109G   22G   82G  21% /
none            4,0K     0  4,0K   0% /sys/fs/cgroup
udev            7,8G  4,0K  7,8G   1% /dev
tmpfs           1,6G  1,4M  1,6G   1% /run
none            5,0M     0  5,0M   0% /run/lock
none            7,8G  188K  7,8G   1% /run/shm
none            100M   48K  100M   1% /run/user
/dev/sda2       200G  177G   24G  89% /mnt/Do