DF(1)							    BSD General Commands Manual 						     DF(1)

NAME

     df -- display free disk space

SYNOPSIS

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

LEGACY SYNOPSIS

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

DESCRIPTION

     The df utility displays statistics about the amount of free disk space on the specified filesystem or on the filesystem of which file is a
     part.  Values are displayed in 512-byte per block counts.	If neither a file or a filesystem operand is specified, statistics for all mounted
     filesystems are displayed (subject to the -t option below).

     The following options are available:

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

     -b      Use (the default) 512-byte blocks.  This is only useful as a way to override an 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 environ-
	     ment.

     -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. This option is now the default to conform to Version 3 of the Single UNIX
	     Specification (``SUSv3'') Use -P to suppress this output.

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

     -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 filesystems.  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 speci-
	     fied, df will not request new statistics from the filesystems, but will respond with the possibly stale statistics that were previ-
	     ously obtained.

     -P      Use (the default) 512-byte blocks.  This is only useful as a way to override an 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 specify 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.

     -t      If used with no arguments, this option is a no-op (Mac OS X already prints the total allocated-space figures).  If used with an argu-
	     ment, it acts like -T, but this usage is deprecated and should not be relied upon.

ENVIRONMENT

     BLOCKSIZE	If the environment variable BLOCKSIZE is set, the block counts will be displayed in units of that size block.

BUGS

     The -n and -t flags are ignored if a file or filesystem is specified.

LEGACY DESCRIPTION

     The "capacity" percentage is normally rounded up to the next higher integer.  In legacy mode, it is rounded down to the next lower integer.

     When the -P option and the -k option are used together, sizes are reported in 1024-blocks.  In legacy mode, when the -P option and -k option
     are used together, the last option specified dictates the reported block size.

     The -t option is normally a no-op (Mac OS X already prints the total allocated-space figures).  In legacy mode, it is equivalent to -T.

     For more information about legacy mode, see compat(5).

SEE ALSO

     lsvfs(1), quota(1), fstatfs(2), getfsstat(2), statfs(2), getmntinfo(3), compat(5), fstab(5), mount(8), quot(8)

HISTORY

     A df command appeared in Version 1 AT&T UNIX.

BSD
								    May 8, 1995 							       BSD