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NAME    [Toc]    [Back]

       du - Displays a summary of disk usage

SYNOPSIS    [Toc]    [Back]

       du [-a  | -s] [-klrx] [directory...]

STANDARDS    [Toc]    [Back]

       Interfaces  documented  on  this reference page conform to
       industry standards as follows:

       du:  XCU5.0

       Refer to the standards(5) reference page for more information
 about industry standards and associated tags.

OPTIONS    [Toc]    [Back]

       Displays  disk use for each file.  Without -a, du does not
       report on files unless directory explicitly names a  file.

              [Tru64  UNIX]  When  run on an AdvFS clone fileset,
              du -a displays the disk use for each  file  in  the
              original  fileset at the time the clone fileset was
              created.  Displays only the grand total for each of
              the  specified  directories,  or for a file if used
              with -a.  Displays block count in  kilobytes  (1024
              bytes)  instead  of multiples of 512 bytes.  [Tru64
              UNIX]  Allocates blocks,  in  files  with  multiple
              links,  evenly among the links.  By default, a file
              with two or more links is counted only once.   Displays
  an error message when du encounters an inaccessible
 directory, or an  inaccessible  file  when
              used  with -a.  Displays information about only the
              specified file system.  For example, if you want to
              display  information  about only the root file system,
 specify both the -x option and the  root  file
              system (/).

OPERANDS    [Toc]    [Back]

       The pathname of a directory to be examined.  All subdirectories
 of directory are examined.

              If directory evaluates to a file  name,  then  only
              information about the file is provided.

DESCRIPTION    [Toc]    [Back]

       The  du command gives the number of blocks in all directories
 (listed recursively) within each specified directory.

       [Tru64  UNIX]  When the -a option is specified, du reports
       the number of blocks in individual files.  The block count
       includes  the  indirect  blocks  of  each  file  and is in
       512-byte units, independent of the cluster  size  used  by
       the system.  If no file or directory name is provided, the
       du command uses the current directory.

NOTES    [Toc]    [Back]

       The du utility is marked LEGACY in XCU Issue 5.

       If too many files are distinctly  linked,  du  counts  the
       excess files more than once.

EXIT STATUS    [Toc]    [Back]

       The following exit values are returned: Successful completion.
  An error occurred.

EXAMPLES    [Toc]    [Back]

       To display the disk usage of a directory tree and each  of
       its subtrees, enter: du /u/fran

              The  previous  command  displays the number of disk
              blocks in the /u/fran directory  and  each  of  its
              subdirectories.   To display the disk usage of each
              file, enter: du -a /u/fran

              The previous command displays the  number  of  disk
              blocks  contained  in each file and subdirectory of
              /u/fran.  The number beside a directory is the disk
              usage  of that directory tree.  The number beside a
              regular file is the disk usage of that file  alone.
              To display only the total disk usage of a directory
              tree, enter: du -rs /u/fran

              The previous command displays only  the  sum  total
              disk  usage  of  /u/fran  and the files it contains
              (-s).  The -r option tells du to display  an  error
              message  if it cannot read a file or directory.  To
              restrict the disk usage information to the root (/)
              file system, enter: du -x /

              The  previous  command  displays  information  only
              about the root file system  and  does  not  display
              information  about  the  file systems located under
              the root file system.


       The following environment variables affect  the  execution
       of  du: Provides a default value for the internationalization
 variables that are unset or null. If LANG is unset or
       null,  the  corresponding value from the default locale is
       used.  If any of the internationalization  variables  contain
 an invalid setting, the utility behaves as if none of
       the variables had been defined.  If  set  to  a  non-empty
       string value, overrides the values of all the other internationalization
 variables.  Determines the locale for  the
       interpretation of sequences of bytes of text data as characters
 (for example, single-byte as opposed  to  multibyte
       characters  in  arguments).  Determines the locale for the
       format and contents  of  diagnostic  messages  written  to
       standard  error.  Determines the location of message catalogues
 for the processing of LC_MESSAGES.

SEE ALSO    [Toc]    [Back]

       Commands:  df(1), ls(1), quot(8)

       Functions:  lseek(2), stat(2)

       Routines:  fseek(3)

       Standards:  standards(5)

[ Back ]
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