du man page on DigitalUNIX

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du(1)									 du(1)

       du - Displays a summary of disk usage

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

       Interfaces  documented on this reference page conform to industry stan‐
       dards as follows:

       du:  XCU5.0

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

       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 (/).

       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.

       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 clus‐
       ter size used by the system.  If no file or directory name is provided,
       the du command uses the current directory.

       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.

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

       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  con‐
	      tained  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 direc‐
	      tory.  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 sys‐
	      tems located under the root file system.

       The  following  environment  variables affect the execution of du: Pro‐
       vides 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	 vari‐
       ables contain an invalid setting, the utility behaves as if none of the
       variables had been defined.  If set to a non-empty string value,	 over‐
       rides  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 multi‐
       byte characters in arguments).  Determines the locale  for  the	format
       and  contents of diagnostic messages written to standard error.	Deter‐
       mines the location of message catalogues for the processing of  LC_MES‐

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

       Functions:  lseek(2), stat(2)

       Routines:  fseek(3)

       Standards:  standards(5)


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