Using the df command

You can see how your system uses space in a single file system by using the df command. To manually display the space on the file system where your current directory is located, enter this command on the command line: 
df .

This system displays this: 

Filesystem    1K-blocks       Used    Available   Use% Mounted on
/dev/sda1      495844         31142      439102     7% /boot

Parent topic: Monitoring file system use (manually)