du(1M)                Maintenance Commands                 du(1M)



NAME
     du - summarize disk usage

SYNOPSIS
     /usr/bin/du [ -adkr ] [ -s | -o ] [ file... ]
     /usr/xpg4/bin/du [ -a | -s ] [ -krx ] [ file... ]

AVAILABILITY
  /usr/bin/du
     SUNWcsu

  /usr/xpg4/bin/du
     SUNWxcu4

DESCRIPTION
     The du utility writes to standard output  the  size  of  the
     file  space  allocated  to,  and  the size of the file space
     allocated to each subdirectory of, the file hierarchy rooted
     in  each of the specified files.  The size of the file space
     allocated to a file of type directory is defined as the  sum
     total  of space allocated to all files in the file hierarchy
     rooted in the directory plus  the  space  allocated  to  the
     directory itself.

     Files with multiple links will be counted  and  written  for
     only one entry.  The directory entry that is selected in the
     report is unspecified.  By default, file sizes  are  written
     in 512-byte units, rounded up to the next 512-byte unit.

  /usr/xpg4/bin/du
     When du cannot obtain file attributes  or  read  directories
     (see  stat(2)),  it  will  report an error condition and the
     final exit status will be affected.

OPTIONS
     The following  options  are  supported  by  /usr/bin/du  and
     /usr/xpg4/bin/du:

     The following options are supported by /usr/bin/du only:  -a
     In  addition  to the default output, report the size of each
     file not of type directory in the file hierarchy  rooted  in
     the specified file.

     -d    Do not cross filesystem boundaries. "du  -d  /"  would
          report usage only on the root partition, for example.

     -o    Do not add child  directories'  usage  to  a  parent's
          total.   Without  this  option,  the usage listed for a
          particular directory is the space taken by the files in
          that directory, as well as the files in all directories
          beneath it.  This option does nothing if -s is used.




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du(1M)                Maintenance Commands                 du(1M)



     -r    Generate messages about  directories  that  cannot  be
          read, files that cannot be opened, and so forth, rather
          than being silent (the default).

  /usr/xpg4/bin/du
     The following  options  are  supported  by  /usr/xpg4/bin/du
     only:

     -a    In addition to the default output, report the size  of
          each  file  not of type directory in the file hierarchy
          rooted in the specified file.  Regardless of the  pres-
          ence  of  the  -a option, non-directories given as file
          operands will always be listed.  -r  By  default,  gen-
          erate  messages  about directories that cannot be read,
          files that cannot be opened, and so forth.

     -x    When evaluating file sizes, evaluate only those  files
          that  have the same device as the file specified by the
          file operand.

OPERANDS
     The following operand is supported:

     file    The path name of a file whose size is to be written.
             If  no  file  is specified, the current directory is
             used.

OUTPUT
     The output from du consists of the amount of the space allo-
     cated to a file and the name of the file.

ENVIRONMENT
     See environ(5) for descriptions of the following environment
     variables  that  affect  the  execution  of  du:   LC_CTYPE,
     LC_MESSAGES, and NLSPATH.

EXIT STATUS
     The following exit values are returned:

     0   Successful completion.

     >0  An error occurred.

SEE ALSO
     ls(1), stat(2), environ(5)

     System Administration Guide, Volume II

NOTES
     A file with two or more links is  counted  only  once.   If,
     however,  there  are links between files in different direc-
     tories where the directories are on separate branches of the



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du(1M)                Maintenance Commands                 du(1M)



     file  system  hierarchy, du will count the excess files more
     than once.

     Files containing holes will result  in  an  incorrect  block
     count.


















































SunOS 5.5.1         Last change: 12 May 1995                    3