DU(1)                      OpenBSD Reference Manual                      DU(1)

NAME
     du - display disk usage statistics

SYNOPSIS
     du [-a | -s] [-chkrx] [-H | -L | -P] [file ...]

DESCRIPTION
     The du utility displays the file system block usage for each file argu-
     ment and for each directory in the file hierarchy rooted in each directo-
     ry argument.  Note that the system block usage is usually greater than
     the actual size of the file.  If no file is specified, the block usage of
     the hierarchy rooted in the current directory is displayed.

     The options are as follows:

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

     -c      Display the grand total after all the arguments have been pro-
             cessed.

     -H      Symbolic links on the command line are followed.  (Symbolic links
             encountered in the tree traversal are not followed.)

     -h      Display numbers in a human readable form.  Use unit suffixes:
             Byte, Kilobyte, Megabyte, Gigabyte, Terabyte in order to reduce
             the number of digits to four or less.  This overrides the -k op-
             tion.

     -k      By default, du displays the number of blocks as returned by the
             stat(2) system call, i.e., 512-byte blocks.  If the -k flag is
             specified, the number displayed is the number of 1024-byte
             blocks.  Partial numbers of blocks are rounded up.

     -L      All symbolic links are followed.

     -P      No symbolic links are followed.

     -r      Generate messages about directories that cannot be read, files
             that cannot be opened, and so on.  This is the default.

     -s      Display only the grand total for the specified files.

     -x      File system mount points are not traversed.

     du counts the storage used by symbolic links and not the files they ref-
     erence 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 fol-
     lowed is not counted or displayed.  The -H, -L, and -P options override
     each other and the command's actions are determined by the last one spec-
     ified.

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

ENVIRONMENT
     BLOCKSIZE  Block counts will be displayed in units of this size block,
                unless the -k or -h option is specified.

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

STANDARDS
     The du utility is compliant with the IEEE Std 1003.1-2004 (``POSIX'')
     specification.

     The flags [-chPr] are extensions to that specification.

     The flag [-r] exists solely for conformance with X/Open Portability Guide
     Issue 4 (``XPG4'').

HISTORY
     A du command appeared in Version 3 AT&T UNIX.

OpenBSD 4.2                    November 13, 2007                             2