df

df (abbreviation for disk free) is used to display the amount of availbale disk space for file systems on which the invoking user has appropriate read access.

$ df -h
Filesystem      Size  Used Avail Use% Mounted on
udev            982M     0  982M   0% /dev
tmpfs           201M   22M  179M  11% /run
/dev/sda1        48G  4.9G   41G  11% /
...(Some more info)

Useful Options / Examples

df [directory_name]

$ df Desktop/
Filesystem     1K-blocks    Used Available Use% Mounted on
/dev/sda1       49702628 5077556  42077208  11% /

--total

display a grand total.

--help

display a help message and exit.

-T, --print-type

print file system type.

-t, --type=[TYPE]

limit listing to file systems of type [TYPE].