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      "Human-readable" output.  Use unit suffixes: Byte, Kilobyte,
             Megabyte, Gigabyte, Terabyte, Petabyte, Exabyte in order to re-
             duce the number of digits to four or less.

     -k      By default, all sizes are reported in 512-byte block counts.  The
             -k option causes the numbers to be reported in kilobyte counts.

     -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.

     It is not an error to specify more than one of the mutually exclusive op-
     tions -h and -k.  Where more than one of these options is specified, the
     last option given overrides the others.

     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 1003.1-2008 (``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 4.7                     August 16, 2009                              2
