DU(1) General Commands Manual DU(1)NAME
du - disk usage
SYNOPSIS
du [ -a ] [ -bsize ] [ file ... ]
DESCRIPTION
Du gives the number of Kbytes allocated to data blocks of named files and, recursively, of files in named directories. It assumes storage
is quantized in units of 1024 bytes (Kbytes) by default. Other values can be set by the -b option; size is the number of bytes, optionally
suffixed k to specify multiplication by 1024. If file is missing, the current directory is used. The count for a directory includes the
counts of the contained files and directories. The -a option prints the number of blocks for every file in a directory. Normally counts
are printed only for contained directories.
SOURCE
/sys/src/cmd/du.c
DU(1)
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du(1) General Commands Manual du(1)NAME
du - Displays a summary of disk usage
SYNOPSIS
du [-a | -s] [-klrx] [directory...]
STANDARDS
Interfaces documented on this reference page conform to industry standards 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 speci-
fied 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 cluster size used by the system. If no file or directory name is pro-
vided, 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 contained 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 dis-
play 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 directory. 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 systems
located under the root file system.
ENVIRONMENT VARIABLES
The following environment variables affect the execution of du: Provides 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,
overrides 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 multibyte characters in arguments). Determines the locale for the for-
mat and contents of diagnostic messages written to standard error. Determines the location of message catalogues for the processing of
LC_MESSAGES.
SEE ALSO
Commands: df(1), ls(1), quot(8)
Functions: lseek(2), stat(2)
Routines: fseek(3)
Standards: standards(5)du(1)