DU(1B) BSD Compatibility Package Commands DU(1B)

NAME

du - display the number of disk blocks used per directory or file

SYNOPSIS

/usr/ucb/du [-adkLr] [-o | -s] [filename]

DESCRIPTION

The du utility gives the number of kilobytes contained in all files
and, recursively, directories within each specified directory or file
filename. If filename is missing, `.' (the current directory) is
used.


A file that has multiple links to it is only counted once.

OPTIONS

The following options are supported:

-a
Generates an entry for each file.


-d
Does not cross file system boundaries. For example, du -d /
reports usage only on the root partition.


-k
Writes the files sizes in units of 1024 bytes, rather than the
default 512-byte units.


-L
Processes symbolic links by using the file or directory that
the symbolic link references, rather than the link itself.


-o
Does 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 the -s option is used.


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


-s
Only displays the grand total for each of the specified
filenames.


Entries are generated only for each directory in the absence of
options.

EXAMPLES

Example 1: Showing usage of all subdirectories in a directory

This example uses du in a directory. The pwd(1) command was used to
identify the directory, then du was used to show the usage of all the
subdirectories in that directory. The grand total for the directory
is the last entry in the display:


example% pwd
/usr/ralph/misc
example% du
5 ./jokes
33 ./squash
44 ./tech.papers/lpr.document
217 ./tech.papers/new.manager
401 ./tech.papers
144 ./memos
80 ./letters
388 ./window
93 ./messages
15 ./useful.news
1211 .

ENVIRONMENT VARIABLES

If any of the LC_* variables, that is, LC_CTYPE, LC_MESSAGES,
LC_TIME, LC_COLLATE, LC_NUMERIC, and LC_MONETARY (see environ(7)),
are not set in the environment, the operational behavior of du for
each corresponding locale category is determined by the value of the
LANG environment variable. If LC_ALL is set, its contents are used to
override both the LANG and the other LC_* variables. If none of the
above variables is set in the environment, the "C" (U.S. style)
locale determines how du behaves.

LC_CTYPE
Determines how du handles characters. When LC_CTYPE
is set to a valid value, du can display and handle
text and filenames containing valid characters for
that locale. du can display and handle Extended Unix
Code (EUC) characters where any individual character
can be 1, 2, or 3 bytes wide. du can also handle EUC
characters of 1, 2, or more column widths. In the "C"
locale, only characters from ISO 8859-1 are valid.


LC_MESSAGES
Determines how diagnostic and informative messages are
presented. This includes the language and style of the
messages, and the correct form of affirmative and
negative responses. In the "C" locale, the messages
are presented in the default form found in the program
itself (in most cases, U.S. English).

SEE ALSO

du(1), pwd(1), attributes(7), environ(7), df(8), quot(8)

NOTES

Filename arguments that are not directory names are ignored, unless
you use -a.


If there are too many distinct linked files, du will count the excess
files more than once.

June 5, 2001 DU(1B)