df

Display free disk space.
With no arguments, `df' reports the space used and available on all currently mounted filesystems (of all types). Otherwise, `df' reports on the filesystem containing each argument file.

Syntax
      df [-b | -h | -H | -k | -m | -P] [-ailn] [-t type]
	[file | filesystem ...]

Options
     -a	     Show all mount points, including those that were mounted with the
	     MNT_IGNORE flag.

     -b	     Use 512-byte blocks rather than the default.  Note that this
	     overrides the BLOCKSIZE specification from the environment.

     -g	     Use 1073741824-byte (1-Gbyte) blocks rather than the default.
	     Note that this overrides the BLOCKSIZE specification from the
	     environment.

     -H	     "Human-readable" output.  Use unit suffixes: Byte, Kilobyte,
	     Megabyte, Gigabyte, Terabyte and Petabyte in order to reduce the
	     number of digits to three or less using base 10 for sizes.

     -h	     "Human-readable" output.  Use unit suffixes: Byte, Kilobyte,
	     Megabyte, Gigabyte, Terabyte and Petabyte in order to reduce the
	     number of digits to three or less using base 2 for sizes.

     -i	     Include statistics on the number of free inodes.

     -k	     Use 1024-byte (1-Kbyte) blocks rather than the default.  Note
	     that this overrides the BLOCKSIZE specification from the environ-
	     ment.

     -l	     Only display information about locally-mounted filesystems.

     -m	     Use 1048576-byte (1-Mbyte) blocks rather than the default.	 Note
	     that this overrides the BLOCKSIZE specification from the environ-
	     ment.

     -n	     Print out the previously obtained statistics from the filesys-
	     tems.  This option should be used if it is possible that one or
	     more filesystems are in a state such that they will not be able
	     to provide statistics without a long delay.  When this option is
	     specified, df will not request new statistics from the filesys-
	     tems, but will respond with the possibly stale statistics that
	     were previously obtained.

     -P	     Use POSIX compliant output of 512-byte blocks rather than the
	     default.  Note that this overrides the BLOCKSIZE specification
	     from the environment.

     -t	     Only print out statistics for filesystems of the specified types.
	     More than one type may be specified in a comma separated list.
	     The list of filesystem types can be prefixed with `no' to spec-
	     ify the filesystem types for which action should not be taken.
	     For example, the df command:

		   df -t nonfs,mfs

	     lists all filesystems except those of type NFS and MFS.  The
	     lsvfs(1) command can be used to find out the types of filesystems
	     that are available on the system.

“A prediction is worth twenty explanations” - K. Brecher

Related:

df man page - Apple.com
quota - Display disk usage and limits


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