du(1)du(1)NAMEdu - Displays a summary of disk usage
SYNOPSISdu [-a | -s] [-klrx] [directory...]
STANDARDS
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.
OPTIONS
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
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
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.
NOTES
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
The following exit values are returned: Successful completion. An
error occurred.
EXAMPLES
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.
ENVIRONMENT VARIABLES
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‐
SAGES.
SEE ALSO
Commands: df(1), ls(1), quot(8)
Functions: lseek(2), stat(2)
Routines: fseek(3)
Standards: standards(5)du(1)
