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


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


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


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.


The following options are supported:

Generates an entry for each file.

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

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

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

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.

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

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

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


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
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 .


If any of the LC_* variables, that is, LC_CTYPE, LC_MESSAGES, LC_TIME,
LC_COLLATE, LC_NUMERIC, and LC_MONETARY (see environ(5)), 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

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.

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).


pwd(1), df(1M), du(1), quot(1M), attributes(5), environ(5)


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)