[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.

     -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

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                             April 22, 2004                             BSD