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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 nei-ther neither
     ther 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 spec-ification specification
             ification 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. 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 environment.

     -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 specified, df will not request
             new statistics from the filesystems, but will respond with the possibly stale statistics that
             were previously obtained.

     -P      Use (the default) 512-byte blocks.  This is only useful as a way to override an BLOCKSIZE spec-ification specification
             ification 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 com-mand: command:
             mand:

                   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 allocatedspace
             space figures).  If used with an argument, 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

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