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

NAME
     df — display free disk space

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

DESCRIPTION
     The df utility displays statistics about the amount of free disk space on
     the specified file system or on the file system of which file is a part.
     Values are displayed in 512-byte per block counts.	 If neither a file or
     a file system operand is specified, statistics for all mounted file sys‐
     tems 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 512-byte blocks rather than the default.  Note that this
	     overrides the BLOCKSIZE specification from the environment.

     -c	     Display a grand total.

     -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 four or fewer 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 four or fewer using base 2 for sizes.	Inodes
	     statistics, if enabled with -i, are always printed in base 10.

     -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 file systems.

     -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 file sys‐
	     tems.  This option should be used if it is possible that one or
	     more file systems 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 file sys‐
	     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 file systems of the specified
	     types.  More than one type may be specified in a comma separated
	     list.  The list of file system types can be prefixed with “no” to
	     specify the file system types for which action should not be
	     taken.  For example, the df command:

		   df -t nonfs,nullfs

	     lists all file systems except those of type NFS and NULLFS.  The
	     lsvfs(1) command can be used to find out the types of file sys‐
	     tems that are available on the system.

     -T	     Include file system type.

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

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

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

BUGS
     The -n flag is ignored if a file or file system is specified.  Also, if a
     mount point is not accessible by the user, it is possible that the file
     system information could be stale.

BSD			       November 23, 2008			   BSD

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