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DU(1)                  DragonFly General Commands Manual                 DU(1)


NAME

     du - display disk usage statistics


SYNOPSIS

     du [-H | -L | -P] [-I mask] [-a | -s | -d depth] [-c] [-h | -k] [-x] [-t]
        [file ...]


DESCRIPTION

     The du utility displays the file system block usage for each file
     argument and for each directory in the file hierarchy rooted in each
     directory argument.  If no file is specified, the block usage of the
     hierarchy rooted in the current directory is displayed.  If the -k flag
     is specified, the number of 1024-byte blocks used by the file is
     displayed, otherwise getbsize(3) is used to determine the preferred block
     size.  Partial numbers of blocks are rounded up.

     The options are as follows:

     -H      Symbolic links on the command line are followed, symbolic links
             in file hierarchies are not followed.

     -L      Symbolic links on the command line and in file hierarchies are
             followed.

     -I mask
             Ignore files and directories matching the specified mask.

     -P      No symbolic links are followed.  This is the default.

     -a      Display an entry for each file in a file hierarchy.

     -h      "Human-readable" output.  Use unit suffixes: Byte, Kilobyte,
             Megabyte, Gigabyte, Terabyte and Petabyte

     -r      Generate messages about directories that cannot be read, files
             that cannot be opened, and so on.  This is the default case.
             This option exists solely for conformance with X/Open Portability
             Guide Issue 4 ("XPG4").

     -s      Display an entry for each specified file.  (Equivalent to -d 0)

     -t      Calculate the apparent size based on the file size (st_size)
             instead of the actual media space used based on st_blkcnt.  This
             is meant to give the caller an idea of how much data is present
             in actual transmittable bytes if it were to be copied or sent
             elsewhere.

             To make this calculation du uses st_size and assumes a media
             blocking granularity of 512 bytes.  Any holes present in the file
             are counted as transmittable data.

     -d depth
             Display an entry for all files and directories depth directories
             deep.

     -c      Display a grand total.

     -k      Display block counts in 1024-byte (1-Kbyte) blocks.

     -x      File system mount points are not traversed.

     The du utility counts the storage used by symbolic links and not the
     files they reference unless the -H or -L option is specified.  If either
     the -H or -L options are specified, storage used by any symbolic links
     which are followed is not counted or displayed.

     Files having multiple hard links are counted (and displayed) a single
     time per du execution.


ENVIRONMENT

     BLOCKSIZE  If the environment variable BLOCKSIZE is set, and the -k
                option is not specified, the block counts will be displayed in
                units of that size block.  If BLOCKSIZE is not set, and the -k
                option is not specified, the block counts will be displayed in
                512-byte blocks.


SEE ALSO

     df(1), fts(3), symlink(7), quot(8)


HISTORY

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

DragonFly 5.9-DEVELOPMENT        April 1, 1994       DragonFly 5.9-DEVELOPMENT

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