Working from the command line has some disadvantages, one of those is that you don't have a constant graphical reminder of physical and available disk space. To check this we can use the command df which stands for disk filesystem

From the command line:
df -h — (the -h means human readable format, so instead values being in bytes, they are displayed at MB or GB etc)

$ df -h

Filesystem Size Used Avail Use% Mounted on
/dev/root 6.0G 3.7G 2.0G 66% /
devtmpfs 214M 0 214M 0% /dev
tmpfs 218M 0 218M 0% /dev/shm
tmpfs 218M 4.5M 213M 3% /run
tmpfs 5.0M 4.0K 5.0M 1% /run/lock
tmpfs 218M 0 218M 0% /sys/fs/cgroup
/dev/mmcblk0p6 63M 20M 43M 32% /boot
tmpfs 44M 0 44M 0% /run/user/1000