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DU(1)                       NetBSD Reference Manual                      DU(1)


NAME

     du - display disk usage statistics


SYNOPSIS

     du [-H | -L | -P] [-a | -s] [-ckrx] [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.  If no file is specified, the block usage of the hierarchy
     rooted in the current directory is displayed.

     The options are as follows:

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

     -L      All symbolic links are followed.

     -P      No symbolic links are followed.

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

     -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.

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

     -r      Generate warning messages about directories that cannot be read.
             This is the default behaviour.

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

     -x      Filesystem 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 VARIABLES

     BLOCKSIZE  If the environment variable BLOCKSIZE is set, and the -k op-
                tion is not specified, the block counts will be displayed in
                units of that size block.


SEE ALSO

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


HISTORY

     A du command appeared in Version 6 AT&T UNIX.

NetBSD 1.4                      October 4, 1996                              1