df

From RaySoft

df reports the amount of disk space used and available on file systems.[1]

With no arguments, df reports the space used and available on all currently mounted file systems (of all types). Otherwise, df reports on the file system containing each argument FILE.[1]

Documentation

Syntax

df [PARAMETER ...] [FILE]

Parameters

General
The following parameters can be used with all version of df:
-h, --human-readable
Append a size letter to each size, such as M for mebibytes. Powers of 1024 are used, not 1000; M stands for 1,048,576 bytes. This option is equivalent to --block-size='human-readable'.
-H, --si
Append an SI-style abbreviation to each size, such as M for megabytes. Powers of 1000 are used, not 1024; M stands for 1,000,000 bytes. This option is equivalent to --block-size='si'.
--total
Print a grand total of all arguments after all arguments have been processed. This can be used to find out the total disk size, usage and available space of all listed devices. If no arguments are specified df will try harder to elide file systems insignificant to the total available space, by suppressing duplicate remote file systems.
GNU
The following parameters can be used with the GNU version of df:
-T, --print-type
Print each file system’s type. The types printed here are the same ones you can include or exclude with -t and -x. The particular types printed are whatever is supported by the system.

References