Вызов команды MAN df

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DF(1)			FreeBSD General Commands Manual 		 DF(1)

NAME
     df -- display free disk space

SYNOPSIS
     df [-b | -h | -H | -k | -m | -P] [-ailn] [-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.

     -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.

     -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.

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 file system is specified.

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.

FreeBSD 4.9			  May 8, 1995			   FreeBSD 4.9